Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the g3xmk5u.aqytial,0 : formation of images by mirrors and lenses has been successful describedaa: ,0 tyml3qi5guxk. by the

A. wave model of light.

B. ray model of light.

C. particle model of light.

D. none of the given answers

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidencpymzpqd-a6 c9i.v5r: e

A. must equal the angle of reflection.

B. is always less than the angle of reflection.

C. is always greater than the angle of reflection.

D. may be greater than, less than, or equal to the angle of reflection.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which-o 3wo q4 fof//-fmhqt mirrors work is

A. refraction.

B. polarization.

C. dispersion.

D. reflection.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane mirror forms 0gc5j+7 hi dmsan image that is

A. real and upright.

B. virtual and upright.

C. real and upside down.

D. virtual and upside down.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Plane mirrors produce images whi .ntgj; ole6j;)br7o kq;mq 3fch

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be smaller, larger, or the same size as the actual object, depending on the placement of the object.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays do not actually pass through z b:rvk 0 xwybg;9p*g jr;t:dsz-f3d)the image location, xd;z:g jbv*syp f 9zr)3k0t:- wdr;g band would not appear on paper or film placed at that location is referred to as

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays pass through the image location, and coulyse:e,29 gtj plc ;qrp.v)7jn d appear on paper or film placg:9e ls 2jynp v7c,;)r.eq tpjed at the that location is referred to as

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible to see l xg ac0k:bu7)2u cumos7s:b ta/ps15wre8z:a virtual image?

A. No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image.

B. No, since virtual images do not really exist.

C. Yes, the rays that appear to emanate from a virtual image can be focused on the retina just like those from an illuminated object.

D. Yes, since almost everything we see is virtual because most things do not themselves give off light, but only reflect light coming from some other source.

E. Yes, but only indirectly in the sense that if the virtual image is formed on a sheet of photographic film, one could later look at the picture formed.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the outer surface of the(9)sjz rpd*nltcfc94mh(ffll+ p :;swn 2uu) spherical shape is rennjff)4lccz+ sud9pl m ;t(:)*hul( 2wr9fspferred to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the inner surface+ 4kcuhr/wav/7 k wwq ;96udawii+1uq4qf1xn of the sphere is ref/av d qif411 6;wuun/k qqa7ixwhc9rk u+ww4+erred to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the radius of curvature of the concave mirror is r, the focal length islf0j+y:g .bdq

A. 2r

B. r

C. r/2

D. cannot be determined from the information given

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to a concave mirror's axis, st5 -6equtd tgr-rikes the mirror's surface near its midpoint. Afu-ttqgd6 e5r-ter reflection, this ray

A. again travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a cone0lxb4o8o;(l vzpzd/wg8uzvry 47d6l ,:b pdcave mirror on a path parallel to the axis is reflected

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely;kxj)qcp kdf 2e +p- of dmc0x/2rbpla0t 0,j0 to a concave mirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. Aaj- xq+jk,0d0x 0l0c2ckp2tp/fd b erpo;)fm fter reflection, this ray

A. travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path through the center of curvat u33h/f2wh p hgyhx m31l8t*nfure is reflecte*n 33yhh uxl2wh f 3g8t1mpfh/d

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. midway between the focal point and the center of curvature.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a concave mirror's surface, crosses the axik z )ykykn/ jf6sx/(z2s at the mirror's focal point before striking thej/fkzk/yys z2n6(x k) mirror's surface. After reflection, this ray

A. travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path through ts8njwk9(q*(-p-z dpt frzv:s he focal point is reflectednss z-pfkjvw 9rpt-dq8(: *z (

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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18#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three rays for finding t22x ll7 5;p:i r .njdygort+qm9htp 2+dqg2lphe image position due to a curved rnq;lgtd yj 9l22:2p5mdqhol p2+t7.xgp+ irmirror.

该题自我估分: (必填) (满分:1.0分)

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a concave mirror, exacr1ngb6 hhrg.ti+ k pff3966b etly at its focal point,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image, and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a concave mirror's cent xok.-7vh6 ijcer of curvature. The image produced by the mirror is locacjho- i. xvk67ted

A. out beyond the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is positioned between a conk-swb5eu ux2 bou-tv qdr+6muy45b/ 2-4wq nacave mirror's center of curvature and its focal point. The image produced by the mirror is bxuw62korbu-nu/ m5 by5vqt4 4se +qdu -wa-2located

A. out past the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is situated between a concave mirror's surface and its focal point. T6q+tv8dc jse/he image formed in this castq8 6+e/vcdsje is

A. real and inverted.

B. real and erect.

C. virtual and erect.

D. virtual and inverted.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror, atwln/+j8-) - gne3k xot dr8 fskom:d*v the same distance from it as its radius of curvat-v+rj3x eolsdmd*t:/gw 8nkkf8 no- )ure,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a (x h(w yf)mr;nconvex mirror, at the same distance from it as its foca yrhxf ;)mn((wl length,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sometimes when you look into a curved mirro8e8fanx7 2scft8k1 /cpvu5nar you see a magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at xau7nea n spv/88c8fkc5t 1 2fthe bottom (convex) side of a shiny spoon, what will you see?

A. You won't see an image of yourself because no image will be formed.

B. You will see a little you, upside down.

C. You will see a little you, right side up.

D. You will see a little you, but whether you are right side up or upside down depends on how near you are to the spoon.

E. You will either see a little you or a great big you, depending on how near you are to the spoon.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Concave spherical mirrg enk/ y2pe2z2ors produce images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be smaller than, larger than, or the same size as the actual object, depending on the placement of the object.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Convex spherical mirrors produc9.q3rzd k;vcae images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be larger than, smaller than, or the same size as the actual object, depending on the placement of the object.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single concave spherical mirror produces an image w/3 dvil: .vuh 4azs2 uvw;(xys xy7w)chich is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex spherical mirror prkw fzs ;lrs/86 s*i-ydoduces an image which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnificatiqxcx -g5(vo a-on for a mirror means

A. the image is inverted, and the mirror is concave.

B. the image is inverted, and the mirror is convex.

C. the image is inverted, and the mirror may be concave or convex.

D. the image is upright, and the mirror is convex.

E. the image is upright, and the mirror may be concave or convex.

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distancm m-qx+ rqmpo2n(q7 qb6/2sp ne is positive, the image formed is

A. a real image.

B. a virtual image.

C. either a real or virtual image.

D. can not be determined.

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is negative, the image formed isr(x3dp j rm90e

A. real image.

B. virtual image.

C. either a real or virtual image.

D. can not be determined.

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is a positiqaq y p(sbf)96) *t a(y6u+kh biabj*0(rvikeve value, the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is a negative6y45v aqo8 zw.a n,2ra/mpt zu value, the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is lazd;dr7.4s3d 0aypb x zjf ,d9, xfqxb7rger than one, then the image isay 0xs7fqd4p,bxz dd7rx.b3;9zjdf ,

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnificatiocq4(vwku9 h y*3aa 3p s-2vkns1gi8yin is smaller than one, then the image ikhuvin1isyya s v42 kaq(3w 8g9-3c* ps

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is equal to one, v*l+mk z)kf lt7k9-s-fdh) l1xl;d ctthen the image is

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light travels fastest)mfc04+is yhd).mnk v;yz sl6v db 0*f

A. in a vacuum.

B. through water.

C. through glass.

D. through diamond.

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For all transparent material substances, the index om3u 22wvcbek+f refraction

A. is less than 1.

B. is greater than 1.

C. is equal to 1.

D. could be any of the given answers as it all depends on optical density.

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An index of refraction less than one for a meditkue oj873b4rnhu t.e5-o-nk um would imply

A. that the speed of light in the medium is the same as the speed of light in vacuum.

B. that the speed of light in the medium is greater than the speed of light in vacuum.

C. refraction is not possible.

D. reflection is not possible.

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The index of refraction of diamond is5 jirshm y5 sqf*6g5,gqc+1z s $2.42$. This means that a given frequency of light travels

A. 2.42 times faster in air than it does in diamond.

B. 2.42 times faster in diamond than it does in air.

C. 2.42 times faster in vacuum than it does in diamond.

D. 2.42 times faster in diamond than it does in vacuum.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidens7xycwk3 k: b v(gy5d1s7 c 2/*kvfqqice

A. must equal the angle of refraction.

B. is always less than the angle of refraction.

C. is always greater than the angle of refraction.

D. may be greater than, less than, or equal to the angle of refraction.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light traveling at an an 6/bgj8b7nk gxgle into a denser medium is refracted

A. toward the normal.

B. away from the normal.

C. parallel to the normal.

D. equally.

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters air from water. The angle of refraction will ofwd 4s fnhz9-nhr 66(be

A. greater than the angle of incidence.

B. equal to the angle of incidence.

C. less than the angle of incidence.

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ray of light, which is travelingslmh* neo jg15e*;o2b in air, is incident on a glass plate at a $45^{\circ}$ angle. The angle of refraction in the glass

A. is less than $45^{\circ}$.

B. is greater than $45^{\circ}$.

C. is equal to $45^{\circ}$.

D. could be any of the above; it all depends on the index of refraction of glass.

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which fiber optics is base0+pz0x/xydxx nczm4m ok w8 99d is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a beam of light passing from watern 1mc-gj0z 9ffbt ;g2qf1(w hk into air is $48.8^{\circ}$. This means that all light rays with an angle of incidence greater than this angle will be

A. absorbed.

B. totally reflected.

C. partially reflected and partially transmitted.

D. totally transmitted.

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which 2vrx8w 3wi1.5 eo: gy .ttcwnalenses work is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thickestcu:6eh2 : jtztr2ypc )u.hr, d at the center called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thinner at the center9 5;wb g git;jt48avn;ab6ayj than the edges are called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thicker at the centertexy f0 gpim)r73gvk 8x2 +g+c

A. spread out light rays.

B. bend light rays to a point beyond the lens.

C. have no effect on light rays.

D. reflect light rays back.

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two diverging lenses are similar except that lensp8ki6k9yqn my o371pd B is rated at 20 diopters, whereas lens A is rated at 10 diopters. The focal mk1iy y7kq8d 3ppn96 olength of lens B is

A. one-fourth of the focal length of lens A.

B. one-half of the focal length of lens A.

C. twice the focal length of lens A.

D. four times the focal length of lens A.

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of a thin concave lens, pkpn0-f p6 gr3strikes the lens near its midpoint. After traveling though the lens, this ray emerges traveling obliquely to the axis of the0-r 6pfpgkp n3 lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through the focal point.

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of a convex thin lens, stri(yzk,dpvpk( 1ts-ux lyg.-)7 p mhpd-kes the lens near its midpoint. After traveling through the lens, this ray emerges tr.p tphyg y7v-lp zku-(sm kd(1dx),-paveling obliquely to the axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through its focal point.

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55#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three rays for 62 dhd kowq1jxt.0zh jqes )09finding the image position due to a thin lens..h2k9xo 0 sqzejw1j0 )qhdt6 d

该题自我估分: (必填) (满分:1.0分)

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has focal l3i4snq eh*urb:.ca 3 zength $f$. An object is located at infinity. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a foccd x j)kzuj7u4,.w7gu al length $f$. An object is placed at $f$ on the axis. The image formed is located

A. at infinity.

B. between $2f$ and infinity.

C. at $2f$.

D. between $f$ and $2f$.

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a r*u )n ttrhsal 8bim5j;k.6.k focal length $f$. An object is placed at $f$ on the axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal x0-n7frl )xe blength $f$. An object is placed between $f$ and $2f$ on the axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. at a distance greater than $2f$ from the lens.

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a fpq2q)rb .pe4ct1yc b:ocal length $f$. An object is placed between infinity and $2f$ from the lens on its axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is placed between a convex lens and its focal point. The image2rx01mh:wb e y formed ywhx: 2rm01beis

A. virtual and erect.

B. virtual and inverted.

C. real and erect.

D. real and inverted.

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The images formed by concave bd5cy ,i7 1x)qncfvs.u 5l* bvlenses

A. are always real.

B. are always virtual.

C. could be real or virtual; it depends on whether the object distance is smaller or greater than the focal length.

D. could be real or virtual, but always real when the object is placed at the focal point.

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The image of the rare stamp you see thrn,hxky df:-,3l1+lrw +gxwmbough a magnifying glass is

A. always the same orientation as the stamp.

B. always upside-down compared to the stamp.

C. either the same orientation or upside-down, depending on how close the stamp is to the glass.

D. either the same orientation or upside-down, depending on the thickness of the glass used.

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lamp is placed 1 m from a screen. Between the lamp and the screv *8jm,1.p ak 3 pjp/8ecyrryhen is placed a converging lens of focal length 24 cm. The filament of the lamp can be imaged on the screen. As the lens positp88,ce3/p1mjh k* yrjpr ay v.ion is varied with respect to the lamp,

A. no sharp image will be seen for any lens position.

B. a sharp image will be seen when the lens is halfway between the lamp and the screen.

C. a sharp image will be seen when the lens is 40 cm from the lamp.

D. a sharp image will be seen when the lens is 60 cm from the lamp.

E. a sharp image will be seen when the lens is either 40 cm from the lamp or 60 cm from the lamp, but not otherwise.

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin lenses, of focal lengths -h(jrog,xb57n:dhqv $f_1$ and $f_2$ placed in contact with each other are equivalent to a single lens of focal length of

A. $f_1 + f_2$.

B. $1/(f_1 + f_2)$.

C. $(f_1 + f_2)/f_1 f_2$.

D. $f_1 f_2/(f_1 + f_2)$.

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin double-convex (convex-convex) rrs0;hlp +qlkli16 3e lenses are placed in contact. If each has a focal length of 20 cm, how would you expec 1e03hpklrsl r;i lq6+t the combination to function?

A. about like a single lens of focal length 20 cm

B. about like a single lens of focal length 40 cm

C. about like a single lens of focal length slightly greater than 20 cm

D. about like a single lens of focal length less than 20 cm

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diverging lens ($f = -4.0 \; cm$) is positioned 2.0 cm to the left of a converging lens ($f = +6.0 \; cm$). A 1.0-mm diameter beam of parallel light rays is incident on the diverging lens from the left. After leaving the converging lens, the outgoing rays

A. converge.

B. diverge.

C. form a parallel beam of diameter D > 1.0 mm.

D. form a parallel beam of diameter D < 1.0 mm.

E. will travel back toward the light source.

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A laser beam strikes a plane's reflecting surface with an angle of incidenc dz rp8bz;ye(x d4 w2ihoj-3v5e of 3dy5pbej( ;82 4rv-xwzhid oz$52^{\circ}$. What is the angle between the incident ray and the reflected ray?

A. $52^{\circ}$

B. $105^{\circ}$

C. $45^{\circ}$

D. $90^{\circ}$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is located 2.6 m in front of:azs,mpv 5 kg)xinqv;aag )jsx r47 7, a plane mirror. The image formed by the mirror appears to sgmv7n7 xsr54az) x,agjpav: i,;)kq be

A. 1.3 m in front of the mirror.

B. on the mirror's surface.

C. 1.3 m behind the mirror's surface.

D. 2.6 m behind the mirror's surface.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far are you from your image when you stand 0.75 m in front of a vertical pltt.ikl c+ ;l*8.u rwwka+kk;c.*8il lrt ww.tune mirror?

A. $0.75 \; m$

B. $1.5 \; m$

C. $3.0 \; m$

D. none of the given answers

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How fast do you approauqmz) q 1vwv55ch your image when you approach a vertical plane mirror at z5uq5 )v qm1vwa speed of 2 m/s?

A. 1 m/s

B. 2 m/s

C. 4 m/s

D. none of the given answers

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical concave mirror has a radius of cf8tk 1rtcrlb/-n(gm- ag1k6rurvature of 20 cm. How far from the mirror is the focalrkt-cl( t8r-16m /r1gkangbf point located?

A. $10 \; cm$

B. $20 \; cm$

C. $30 \; cm$

D. $40 \; cm$

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave mirror with a radius of 20 cm creht9z/n ,cwp7+v)ggt ey4bxr7ates a real image 30 cm from the mirror. What is the obbt7w+g) x c/7tvr,4 pe 9nzyghject distance?

A. $20 \; cm$

B. $15 \; cm$

C. $7.5 \; cm$

D. $5.0 \; cm$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is 12 cm in front of a concave mirror, and the image is 3.0 cm ini getxiji5*b8-1pt, o front of the mirror. What is the focgx tp-5,8*ebtjii1i oal length of the mirror?

A. $15 \; cm$

B. $4.0 \; cm$

C. $2.4 \; cm$

D. $1.3 \; cm$

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10 cm in front of a concave mirror k s1lq ,lfdlif:9j1;j with focal length 3 cm. Where is the imagek11 ;ld9qlj:i,fjsl f?

A. 13 cm from the mirror

B. 7.0 cm from the mirror

C. 4.3 cm from the mirror

D. 3.3 cm from the mirror

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of e0s1 iovpyd.q r(8cxe b2wf :d6k m.p;20 cm. An object is placed 10 cm in front of the mirror on the mi i m kp 0:p2x1(oervqys.. ddfwbc;e86rror's axis. Where is the image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirro cu; 2c 3g0etd5yi /cgrny(b,gqf77pbr has a focal length of 20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the image locat fggqiycgb ( t 7;uecc5p02n/,r3d7byed?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 5.7 cm from a concave myfln 1x )ze i/t:6o/uu, brnkghv1o/lxyl02*irror. The image is 4.7 cm tall, and 10 cm from the mirror. How tall iske:0lon11 lyur6t /f xbxh *,vg/n u)zoyl /i2 the object?

A. $12 \; cm$

B. $11 \; cm$

C. $8.2 \; cm$

D. $2.7 \; cm$

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirror of focal length 20 cm. 8g)hhpbj(g).j9 mwo b2u6 wahThe object is 4.0 cmpjogg9hw m8j bh6. b)h) 2(uwa tall. How tall is the image?

A. $1.0 \; cm$

B. $2.0 \; cm$

C. $8.0 \; cm$

D. $16 \; cm$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 47.5 cm tall. The image is 38.6 cm tall, and 14.8 kd 5+jza3/s wu caf u(91as8ftcm from the mirror. How aafwtuk jsac+d1(z s 9uf583/far is the object from the mirror?

A. $124 \; cm$

B. $47.6 \; cm$

C. $18.2 \; cm$

D. $12.0 \; cm$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.4 cm tall object is 4.0 cm from a concave mirror. If the image is 4.0 k4 te9 v8va,jxkfw 0vr4.d4ebcm tall, a 4 44 9t 8fkdw.v,xjekr0bvevhow far is it from the mirror?

A. $11 \; cm$

B. $9.4 \; cm$

C. $1.4 \; cm$

D. $0.090 \; cm$

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a u1m jo 6bkc glvvh3k9lj wta41):4 p5+-gxsbkconcave mirror of focal length 20 cm. The object -g4kguh 14osk+b6v lv: bjt5xja1lwpk 9m)c3 is 4.0 cm tall. Where is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 40 cm in front of a cosmetic mirror (concave mir(e ;u0 a+,spe*aawq6i 1 ckg/lcvey;sror), the erect image is twice the size of s60lekac up+ea;s(q ;vi ,we* g/1caythe object. What is the focal length of the mirror?

A. $27 \; cm$

B. $40 \; cm$

C. $80 \; cm$

D. $160 \; cm$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person's face is 30 cm in fr xin97e5e/nj jqui )i9ont of a concave shaving mirror. If the image is an erect image 1.5 times as large as the objece5 jqi9 ine7ux/i9n) jt, what is the mirror's focal length?

A. $20 \; cm$

B. $50 \; cm$

C. $70 \; cm$

D. $90 \; cm$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 cm behind a concave mirror with focal length 5.0 c ;yfjo8-8jbyh26ae x gm. Where is thyo28gjfhb-yx8 ;je6a e object?

A. 2.2 cm in front of the mirror

B. 2.2 cm behind the mirror

C. 9.0 cm in front of the mirror

D. 1.0 cm behind the mirror

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focal length of -20 cm. An object itx)c :q7f( 6g6:o*waqqcdlr cs placed 10 cm in front of the mirror on the mirror's a w6)oq*7rcqxl:cdf (:tc 6qg axis. Where is the image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focal le9c/4zfdmjnf ./7pwd rngth of -20 cm. An object is placed 30 cm in front of fj rf/dw7/z49cndmp. the mirror on the mirror's axis. Where is the image located?

A. 12 cm in front of the mirror

B. 60 cm behind the mirror

C. 60 cm in front of the mirror

D. none of the given answers

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 14 cm in front of a convex mirror. The image is 5.8 cm behind the ju05 1*dx /aa 4qfxq5 q4pwyfbnx6uy6mirror. What is the focal lengthf/bxq 4j104 xyax5qun *dq6pw56yfu a of the mirror?

A. -4.1 cm

B. -8.2 cm

C. -9.9 cm

D. -20 cm

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 8.90 cm tall. The image is 7.80 cm tall, and 14.8 cm from aq5 s +kdpx:;uu*w3zzimj 4k ns+p6za0 convex mirror. What is the mirror's focal le ;p:mxiz*an 5pzqs6z +3k4kj0usw +udngth?

A. -120 cm

B. -105 cm

C. -16.9 cm

D. -13.0 cm

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a material has an index of refraction of 1.50, what is the speed cxw t pcpbpr3c-fes26,onif 8h9;x 8,of light throug9x fncp8ectihf o 8,;xrs26cpbwp,3-h it?

A. $2.00 \times 10^{8} \; m/s$

B. $3.00 \times 10^{8} \; m/s$

C. $4.50 \times 10^{8} \; m/s$

D. $6.00 \times 10^{8} \; m/s$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray in air is incident on atw+3llp0 -by r q3ad+ uqul7h2n air to glass interface at an angle of $45^{\circ}$ and is refracted at an angle of $30^{\circ}$ to the normal. What is the index of refraction of the glass?

A. 1.23

B. 1.31

C. 1.41

D. 1.74

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance from air atf/cwwa :3d7ra*hwk, qpk lxr h( 4ar)6 an angle of $32.0^{\circ}$, and continues at an angle of $23.0^{\circ}$. What is the index of refraction of the substance?

A. 0.74

B. 1.11

C. 1.28

D. 1.36

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light passes from air zo/d;m,krl8na1h/ 8 ahqil3ato water. The incoming ray is at an angle of $17.0^{\circ}$ to the normal. The index of refraction is 1.33. What is the angle in the water?

A. $22.9^{\circ}$

B. $22.6^{\circ}$

C. $18.3^{\circ}$

D. $12.7^{\circ}$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An oil layer that is 5.0 cm thick is spread smoothly and evenly over the sukqgrt35yh/r- rface of water on a windless day. What is the angle of refraction in the/3y-tr5 rq kgh water for a ray of light that has an angle of incidence of $45^{\circ}$ as it enters the oil from the air above? (The index of refraction for oil is 1.15, and for water it is 1.33.)

A. $27^{\circ}$

B. $32^{\circ}$

C. $36^{\circ}$

D. $39^{\circ}$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diver is 1.2 m bene+e /j8 a,z0f kj0demjyath the surface of a still pond of water. At what angle must the diver shine a beam of light toward the surface in order for a person on a distant bank to symz e8,+jf0jja/0k deee it? (The index of refraction for water is 1.33.)

A. $41^{\circ}$

B. $49^{\circ}$

C. $59^{\circ}$

D. $90^{\circ}$

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96#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light, traveling in air, strikes a plate of tranqs-5omn6f sm)tk-q / fsparent material at an angle of incidence ofms-f5t)kosf 6 /nq-qm $56.0^{\circ}$. It is observed that the reflected and refracted beams form an angle of $90.0^{\circ}$. What is the index of refraction of this material?

A. 1.40

B. 1.43

C. 1.44

D. 1.48

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97#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light traveling in air is incide 1pmt/;sv 9zvvs7efe8 nt on a slab of transparent material. The incident beam and the refracte ;9f1zv pee/ts 7svv8md beam make angles of $40^{\circ}$ and $26^{\circ}$ to the normal. What is the speed of light in the transparent material?

A. $1.0 \times 10^{8} \; m/s$

B. $2.0 \times 10^{8} \; m/s$

C. $2.3 \times 10^{8} \; m/s$

D. $3.0 \times 10^{8} \; m/s$

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98#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A substance has an index of refraction of 1.-) 0e7pmyda kg46. Light is passing through it at d-pe07 )akygm$53.0^{\circ}$. At what angle will it leave into the air?

A. It will not leave.

B. $59.1^{\circ}$

C. $43.2^{\circ}$

D. $33.2^{\circ}$

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99#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the critical angle for light traveling from crown gla2t(s sc b5nvcth) l17zx hh5w;ss (n = 1.52) into water (n = 1.3v17shwbcn 2t( )t lh hcxs55z;3)?

A. $42^{\circ}$

B. $48^{\circ}$

C. $57^{\circ}$

D. $61^{\circ}$

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100#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lucite has an index of refraction of 1.50. What ivy,k:-a:s 7gvd6cwl ms its critical angle of incidelwyg-7 v6dkc: am:,sv nce?

A. $11.6^{\circ}$

B. $15.4^{\circ}$

C. $41.8^{\circ}$

D. $87.4^{\circ}$

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101#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optic fiber is made of clear plastic 8-h huoj pqkqu2is4+w;wv; rcgm*2w7with index of refraction of 1.50. For what ah2r h7s*+ocq;2uk q8wvi-ujg 4;wwm pngle of incidence will light remain within the plastic "guide"?

A. $>23.4^{\circ}$

B. $>38.3^{\circ}$

C. $>40.3^{\circ}$

D. $>41.8^{\circ}$

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102#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for 5+ l5ed;vwmqg3zaj i, 84r1yv t5bwtjht*n 6aa substance is measured at $57.3^{\circ}$. Light enters from air at $45.0^{\circ}$. At what angle will it continue?

A. $34.7^{\circ}$

B. $45.0^{\circ}$

C. $53.7^{\circ}$

D. It will not continue, but be totally reflected.

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103#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance from ai2opu 1p-k jx,dr at $30.0^{\circ}$ to the normal. It continues through the substance at $23.0^{\circ}$ to the normal. What would be the critical angle for this substance?

A. $53.0^{\circ}$

B. $51.4^{\circ}$

C. $36.7^{\circ}$

D. $12.6^{\circ}$

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104#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optical fiber is 1 u:xv24kzh et mpklyy 71v67u6.0 meter long and has a diameter of 20 mm. Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make before 14y:7emu xhtk 7lu pk2z6vy6v it emerges from the other end?

A. 42,000

B. 26,000

C. 24,000

D. 18,000

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105#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 40 cm in front of a 20 cm focal length convergi wi b2,yh j(u-)ut1we:1zny gzng lens. How far is the image 1h)w uztgwbjy( z :neyu-12i,of this object from the lens?

A. $40 \; cm$

B. $20 \; cm$

C. $13 \; cm$

D. none of the given answers

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106#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 12 cm in front of a converging lens with focal length 4 c:bfj (vl9m o.16 fnp,fam0u6 gd-rrzfm. Where is the image mpro69rvf0zm ,lj-.6gbnu( ff:1fad ?

A. 8.0 cm behind the lens

B. 6.0 cm in front of the lens

C. 6.0 cm behind the lens

D. 4.0 cm in front of the lens

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107#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15 mm in front of a converging lens, and (rdsv462w-w w0j mqy 5 n5qofkthe image is 4.0 mm behind the lens. What is the fowm-vwkq62j(4 no 5dq f5s0ywr cal length of the lens?

A. $11 \; mm$

B. $5.5 \; mm$

C. $3.8 \; mm$

D. $3.2 \; mm$

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108#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 14-mm tall object is 4.0 mm from a cozvs+z*pk (pi+nverging lens. If the image is 4.0 mm tall,+pik*v(zzp s+ how far is it from the lens?

A. $14 \; mm$

B. $8.7 \; mm$

C. $1.4 \; mm$

D. $1.1 \; mm$

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109#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is 40 m in front of a converging lens the inverted image is hagcg3 ;x2dt h6vpc w8+xd8no5ylf the size of the object. What is the focal lengtd+g2 dogn6x yvw 3ptx5;8h c8ch of this lens?

A. $13 \; cm$

B. $20 \; cm$

C. $40 \; cm$

D. $53 \; cm$

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110#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 mm in front of a converging lens with focal length 5.0 mm. Wherfcg; yngub g9. a.u7v0e is the v.. a f0c9b7g;uygnguobject?

A. 2.2 mm in front of the lens

B. 2.2 mm behind the lens

C. 9.0 mm behind the lens

D. 20 mm in front of the lens

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111#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 4.1 cm tall, and 10.3 cm from a converg 3cng x1wi)an/ing lens. The image is virtual and 6.2 cm tall. What is the focal length of the wg)x na31c/in lens?

A. $6.8 \; cm$

B. $10 \; cm$

C. $16 \; cm$

D. $30 \; cm$

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112#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15.2 mm from a converging lens. The image is 4.0 mm tall le*s2 m-oyba,, and 9.0 cm from the lens. my *2als ,oe-bHow tall is the object?

A. $6.8 \; mm$

B. $5.4 \; mm$

C. $1.7 \; mm$

D. $0.68 \; mm$

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113#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is placed 60 cm fr/xw cq ;0*4+l nqf/ifztref c dk.3(gzom a converging lens, it forms a real image. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What is the focal length of the ( x*zwfln/ f.4q+/dirk 3t qccgze;0flens?

A. $20 \; cm$

B. $30 \; cm$

C. $40 \; cm$

D. $42 \; cm$

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114#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 30 cm from a thin convex lens. The lens hz*,fi n22j/ .k h5jj u lwksnliye,6p/ea87wxas a focal length of 10 cm. What are the values, respectively, of the image distance and later/ *.uxi w,jfji 5,2n as2 lz7ynhewkjp/ lk68eal magnification?

A. 15 cm, 2.0

B. 25 cm, 1.0

C. 60 cm, -0.50

D. 15 cm, -0.50

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115#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a diverging lens wiqinx-dg(i(l n( jlf,vyj v5o4 nt96*yth a focal length of 10 cm. What is the imagv4n9vy,6t 5qii n (yng(lfjd*lxo -(je distance?

A. $7.5 \; cm$

B. $-7.5 \; cm$

C. $15 \; cm$

D. $-15 \; cm$

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116#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a diverging lens with a wi (*ro:t 5lx c.2qjwnyg*i c(m(zpt 2focal length of 10 cm. What is the magnifica:2 j (*itcwl mzq *wroyp(c.gx2(5 inttion?

A. 0.25

B. -0.25

C. 0.67

D. -0.67

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117#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10.4 cm tall, and 4.8 cm in front of a divejv98t jt)gy2iv x 71ijrging lens. The image is 4 iv)tx1j29v7 yijtjg8.0 cm from the lens. How tall is the image?

A. $13 \; cm$

B. $8.7 \; cm$

C. $5.4 \; cm$

D. $1.8 \; cm$

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118#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 6.0 cm t woa)l1) 9wjohall, and is in front of a diverging lens. The image is 2.5 ) )oa ww1h9lojcm tall, and 7.5 cm from the lens. What is the focal length of the lens?

A. -6.0 cm

B. -7.5 cm

C. -13 cm

D. -18 cm

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119#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 40 cm from a thin lensayl9,fqrf4 6p5mf4 pyy6 o4 zf. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the object, what is the focal length of the le ,a q 6mpfffpoy5y44ly649f zrns?

A. $45 \; cm$

B. $75 \; cm$

C. $90 \; cm$

D. $200 \; cm$

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120#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a lens of focal leng9 cbcxwjj+mb8hm-4 kz6in *0pth 50 mm must the object be placed if it is to form a vck*9 60x-bwjj m+nbm4p izc 8hirtual image magnified in size by a factor of three?

A. $33 \; mm$

B. $42 \; mm$

C. $48 \; mm$

D. $54 \; mm$

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121#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a 50-mm focal length lens, such as is w+ h;ue+hx :ci3xdee9used in many 35-mm cameras, must an object be positioned if it is to form a real image magnified in size by a factor oi 3d+9x+ee;exu hc w:hf three?

A. $46 \; mm$

B. $52 \; mm$

C. $58 \; mm$

D. $67 \; mm$

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122#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two very thin lenses, each with focal length 20 cm, artd-khio k 4vr; a 94tkkk1fv5(e placed in contact. What i d19(kktkv4-vrfik;o akh54 ts the focal length of this compound lens?

A. $40 \; cm$

B. $20 \; cm$

C. $15 \; cm$

D. $10 \; cm$

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123#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex (convex-convex) thin lens has radii of curvature 46 cmwv oubvq8k4fi7k(f .a w18qt 7, and is made of glass of index of refraction n = 1.60. What is the focal lef7. f4bv8q8q7 v1oktwu( waik ngth?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens ma,lv i ymrswq8;b s)40kde of glass (n = 1.50) has a radius of 40 cm on the front side and 30 cm on the back side0sl4vs mq8i )rkw,;b y. What is the focal length of the lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by oy; / ga,88r0fmvfymiusing a piece of plastic (n = 1.70). The radius of the front surface is 20 cm and the ram/m;a0v rfo 8yifg 8y,dius of the back surface is 30 cm. What is the focal length of the lens?

A. $17 \; cm$

B. $86 \; cm$

C. $-86 \; cm$

D. $-17 \; cm$

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126#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plano-convex lens is to have a focal length of 40 cm b9wdh/bkjbvbc.(x,)hna 3y+. It is made of glass of indey9+bvx kcabw(.nhh/, jbb )3d x of refraction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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