Physics Unit23: Light and Geometric Optics

1#

Reflection, refractionv/bg3 *nuu5htcge9;r 6mr* mc, and the formation of images by mirrors and lenses has been successful described by th6 3hcm;c/g9tme*ru*u5bvn r ge

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 incidence aa129rr k1gkgucy1w2

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 j3htpub:ag pnf-- 0 8qmirrors 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 an i kvuda3q,ga8.mage 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 imag4/sk9;: *vs,odu0 tfbx bwjmq es 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, 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 x29u,b hc5rqokk+ o1u zgo+6w + w+beydo not actually pass through the image location, and would not appear on paper or film placed ato,y51+uh bq okxk+bwc w eoug+6z29+r 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 locationf qbc7 /a6 7);alizth6ixd ak+, and could appear on papetdk)a 7+zq6b6a lii;f ha/7xc r or film placed 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 vp93:bugi/km 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 refler j9fprdhzb2 g4cof5(vu5 2d+ction takes place on the outer surface of the spherical shape is referred to as azfc(hu5vgdf do4 9b +jp5r22r

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 of the s+w:u crj;: t 8f.phqauphere is reu8+wcut :ah. fr :jpq;ferred 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 jomq vq 0px496esn5.-xehj uk wk5m( :focal length is

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 mwm4p og(ir) 7f6t8x iwraw zb0yv 1;,iirror's axis, strikes the mirror's surface near its midpoint. After rew)b4gyxf7;opmr 8 ztai0w6v(i,r 1iwflection, 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 concave mirror on a path parallel5mliqs y+.-sw 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 to a connze 5fz:c)l8kcave mirror's axis, crosses the axis at the mirror's center of c):nzef8c l5z kurvature before striking the 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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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror7i seq g2 9k78cf1whzd on a path through the center of curvature is refle i7qzsfc gkw82h de917cted

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 pxg3l*9xthm dn--v, va concave mirror's surface, crosses the axis at the mirror's focal point before striking the mirrohv3x m,v*t-dg n9l-pxr'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 the focal point is r.yn , ztm9qb(21hd u2wxdik /ueflectedbx,(d d 1m/y9hqz ktn.2 ui2wu

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 the iy .o yd is-*x .0pgm3d.svyz e0e.:ipsmage position due to a curved mi0yo p.dyy:3ps-vxgi e.0.z d*si. se mrror.

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, exactly at its foca0) )r f :ulgtj7jgnf(jl 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 center of curvature. The image 5q szf ln/,li/produced byzl/5qf iln, s/ the mirror is located

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 concave mi;j;qgng w-uf midv)-)rror's center of curvature and its focal point. The image produ;)injw) u-gd - mg;qfvced by the mirror is located

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 lpjyg 291mvitoiy5n-u -)cr4's surface and its focal point. The image formed in this case isnjgo yi2c l)pt5mi1y r9 -u4v-

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 com)e1kgk/pxw, c.x)d hnh 3;s tnvex mirror, at the same distance from it as its radxckd3)hpkt1 hm /;n.se )g,xwius of curvature,

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 convex mirror, at the same di70/e ,y4x+j slrfqfyjstance from it as its focall,syeyf0r jjq/f x7+4 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 mirror you see a magnified image (a greakhmi;z6* umwp9 ytn (jz: 5n9ut big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) side of a shiny spoon, what will you see65m; *wm9 zyn:9t kijnhz(uup?

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 mirrors produce images whfy g5yr:o3vkw;bkd*(r(vx h5k5:w eg ich

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 mirjb ar qok)q2-nvtn,.t70p4 firors 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 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 which +zu b 1rb*e5inis

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 p3t5ai/h f6w7mt +f eaproduces 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 magnificat c ,kf,(zkhth+:wu7ziion 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 distance ghrzk.0iq : (5qdtw (w ,sq3 ru-a.ewpis 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 imag-xvtab6d u5+7fup2q(jmuw 5be formed is

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 )lrk wh34xszbm+ zf:*(lr s*vd p1xk 5is a positive 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 a1vyd. f /h5k tl kk12rixedhg04 es;881y hldi negative 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 orgb flhs iw18vf36i30f the magnification is larger than one, then the image isl v6hrb30 fsgi1i8wf3

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 magnification is smaller than one, then the imagxjny i0x: mbp. nblb*)xm( nf4r6n4(ee isnp(6 (l b4:4mx*j.enmib) ybn rx0n xf

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 wkng d+be4 e/n19nz9sn .k, ccequal to one, then 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 fastes3v33otiyvh3,lt a-*al o lbm*t

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 materiaga :x.c d,rj fvs.a)*ql substances, the index of 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 medium would impq8b.wl ka29lt ly

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 gxto5czy/c4 l :knv /n097aqxdiamond is $2.42$. 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 incidenlhs tdz9 1n j1yd/6mc/d jxz0/ce

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 angle into 6o e(2kak*sa:/xz;n/ex ixygkd-rg( 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 re08qhx st7ke:a s7tk -nfraction will 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 traveling in air, is incident on a glass platw g7x0+-ppeh. x sj hbo+g16nie 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 based is4 z,py)yj*kbl u6 goddf,0w 1z

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 pakwgtk*ah) l h 9ysqsag) zid :89u9;p3ssing from water 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 lensesgld/oj;9i u9r92msz a 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 thickest at the center called4oxsr00c0ap xqrk 40d

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 centey ,- u yvh0a6rinzty+)cb3b h:r 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 ch4.(y0.rj :watf skyj enter

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 lens B iskz w 8mt; .-prujm u.kv4:v3jh rated at 20 diopters, whereas lens A is rated at 10 kv puhjjw:ztm -4k.v3r8u;.mdiopters. The focal length 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, strikes th.;hdt03dbc 5qlmhs9xei 9 1 vhe lens near its midpoint. After traveling though the lens, this ray cs3tvhx;mh1b h5 d del .q990iemerges traveling 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 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, strikes thwe9jb0e -eb:uuva/ 8g e lens near its midpoint. Abue/a0b g- eveuw9 j8:fter traveling through the lens, this ray emerges traveling 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 finding the image position due , 8qu)hkuh;nkto a thin lens,)knq8ku h uh;.

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 lenwb5u. 0margvan/ ey 48t3*ahhgioslc5jk;-+ gth $f$. 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 focal length 5vocb qz7ne)klg,g 5)$f$. 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 focal length r 6t/q/f-sow/t;p mhs $f$. 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 length6flgk2, tbup 7 $f$. 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 fo-ze** uifn+i acal 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 iq)85x a)j z,itken.r point. The image formed aqi )ne.z8,x kr5ijt)is

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 lnhfn8w-8 kn g.a8w-y menses

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 thr+4f4/tqmglkkv3) md)s u 6z sn;opv,jough 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 sr hb7xu/f :5,pju eb6qcreen is placed a converging lens of focal length 24 cm. The filament of the lamp can be imaged on the screen. As the l76 bp,u:x5h / uerqbfjens position 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 focaldr b 80fb cljc1m8(.bpfp+ lg4 lengths $f_1$ 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-bv7zueppl.) :convex) lenses are placed in contact. If each has a focal length of 20 cm, how would you expect the combination toeul.vz :b pp7) 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 l)ls*nnt4-sy0 ht /wdincidence of ns wd*4sn yt/0)tl-lh$52^{\circ}$. 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 ing(qo:8wmpu9i f g0c.b front of a plane mirror. The image formed by the mirg .90 gwpcb (8qmfiou:ror appears to 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 sdskk:g +h:r)s(x+f ,l wk-idvwt vf ;:tand 0.75 m in front of a vertical plane mi+:, hsd-) ;ls i:krwtv:gkfk(wf +vxdrror?

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 approach your imaleczaf/m b9ta 53+n09eeoj .c ge when you approach a vertical plane mirror at a speed o f.jc5a+loeetcbe39n0mz9 a / f 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 curvatu-cx39s3su j b bte+tpzw9 ay(4re of 20 cm. How far from the uwsext 3-cjs9bbp(3yt94 a+ zmirror is the focal 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 5unbt.htgc, 1yjawm89xhe7 a/9q3smkuo( g 6cm creates a real image 30 cm from the mirrot gk, bsxmeg(qhy8uc19ua. w97ht3 65/ nmjaor. What is the object 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 iswz:7r odq9qo3( ;v mnv 3.0 cm in front ofo ;nz :ovwrq(q 73mvd9 the mirror. What is the focal 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 with-b ehb */vsw (b0e0g2gdz u6mt focal length 3 cm. Where isbbuz-0hg tee g*m vsb6(/d2w0 the image?

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 20 cm. An object is plax vz1ej z jx(vw:o/sh.ce4j;a9 p;0 vrced 10 cm in front of the mirror on the mirror's axive9xve0;rwv a : x/ p jj;h1.sz(4joczs. 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 mirror has a focal length of 20 cm. An object isfx2- ,)y, ker8fs7b* ;inok rp7wde he placed 30 cm in front of the mirror on the mirror's axis. Where is the ii)kk xb2ror*f we;d sen7, y8f,-hp7e mage 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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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 mirromjnknea /xwp1 e/ ;6;fr. The image is 4.7 cm tall, and 10 cm from the m;fj1ae /e/x6w mnn;p kirror. How tall is 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 cmoq 7bq8v0;u3( z 2 exsvkdke5f8c+ks c from a concave mirror of focal length 20 cm. The object is ob v0+2uq3 (ks8x z kc;eqfvs8cd ek754.0 cm 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 cm from thrb;sk-voqrahg4 8d e+9(l g-ie mirror. How farbadsik9v - hg;r+ -8er g(l4oq 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 ima1gjr in:j wmq2/iu5 v6ge is 4.0 cm tall, how farqvn5 u1i/r:mj g iw26j 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 concave mirror of focal length 20 cm. Thfy5;08hjlgook ve 7)y e object is gky85v0ey7o ;lhofj) 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 mirrorzd t49;n4h -tjd6,vw h8 zn qvt,ea6ie (concave mirror), the erect image is twice theh98 6-,hjqtd t4envedw4vz ;zai 6 nt, size of the 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 front of a concave shaving m hmux)q;vsmoz; ) +9gyirror. If the image is an erect image 1.5 times as large as the object, whatm))qzhus ;my9+v go; x 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 behinlw2td)qhy0f h t;cl:3 d a concave mirror with focal length 5.0 cm. Where is the :ld yqtf;w3)cl hh2t0object?

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 (aa) q-csop85pe: nnxobject is placed 10 cm in front of the miqa :nepx8c(o)p 5as-nrror on the mirror'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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87#

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 -23rk 7sg(mit0 bf/avm- 0 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the image loca/3ktms(rmf - 7aivb0gted?

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 co6+ 5d -qx3n+vf0bfrzp:r flwtnvex mirror. The image is 5.8 cm behind the mirropr+qlvb frwd3 x6z0+5f:-nt fr. What is the focal length 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. gp**q8jh,:ckksu2ss r ) z)qr The image is 7.80 cm tall, and 14.8 cm from a convex mirror. *sk)cr gh,)q : ssp*ku qrj82zWhat is the mirror's focal length?

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 refr9ffjg*g;4 bwjaction of 1.50, what is the speed of light throuf;*gf j g9bjw4gh 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 an air to glass interfa *,.0w1evp tr1ahswdhce 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 substancerc54h gg9vjq- from air at 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 to water. The incoming ray is at an angle orvv-2y)c/xe vf $17.0^{\circ}$ 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 5.0c,7pvy m lr9z0l7yel5 cm thick is spread smoothly and evenly over the surface of water on a windless day. What is tc y5zl7ylmev ,l90rp7 he angle of refraction in the 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 beneath3.pp:toyak r8k*1djy 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 see it? (The index of refractp 3kt*8jya od 1:rpyk.ion 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 m;fwnpb2qh4 wse8 v 11hnp10 nin air, strikes a plate of transparent material at an angle of incide1qw01fhwp14nsp v8;bh 2n nmence of $56.0^{\circ}$. 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 traveling0 *i fxlnia,e5 in air is incident on a slab of transparent material. The incident bea 0a ln,*fi5exim and the refracted 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 1.46. Light is passing through it 1;c o+n0cmk mkat ckm+0c m1ko;n$53.0^{\circ}$. 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 f(5joi0usittin0fk ) (9u yx3kor light traveling from crown glass (n = 1.52) into water (n =in 0k)tij5uf(s ty(k 0uxi o93 1.33)?

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 is its critical angle ofi y/nze2rqls / xt 7/c6-qvt8e incidentx/e/qcve n/-ys2i7 rtq l68zce?

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 plastiu.oulm 5)iy0*pyzl hv2k0)dxc with index of refraction of 1.50. For what angle of incidence will light remain w0.yuui*) yhl05)xo2pmkz ldv ithin 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 axzp*) j5j9 oxb 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 fromm2 :6s 21bi-w c v91apfnbtntd air 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 1.0 meter lon7hnt4 r g6ftx83nqe5fh m(x3x ( xsjo.g 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 xmg78 hf5xfn 3.se6xqonrt4j3h(xt ( will make before 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 iayo9b xqk-b9 ddo/y6 3n front of a 20 cm focal length converging lens. How far is the image of thisq/xybd b3 6yo-99 kdao 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 fc,-+i m* 8lq)dh *khekvppij+ront of a converging lens with focal length 4 cm. Where is the imp -,h*8h++pqick)j ek i vdm*lage?

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 frofq(je8- jd8xp*hxfb4a .+xwn fog2h,nt of a converging lens, and the image is 4.0 mm behind the lens. What is the focal length of the ledao8b*(f-.e,xp+g8 xwh jh j2ff4xnqns?

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 4i i7s6gkv e5hevor;f.u9t7 0 a.0 mm from a converging lens. If the image is 4.0 mm tall, how far ifos75hvtu . 0eer kavg69i;i7 s 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*mnp g ox*r/1)t u:km1te3 lok in front of a converging lens the inverted image is half the size of the object. What is the focal lp e)k/go*31 mo1n xtumkr* t:length 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 mmqb)ci ne(dg s 7; oiw1ql+xh;5. Where is the objecq7q5se;;b)n( xgici1h wl +dot?

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 converging lens. The imagahe x:7*kq c)pi qoq15e is virtual and 6.2 cm tall. What is the focal lengt* c7xoi p1)ehq5kq:a qh of the 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 is7ed7 7faw w/nr 4.0 mm tall, and 9.0 cm from the lens. How tall ne/f7wadw r77 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 from a converging lens, it forms a real ima 9ou5v+wsa(o0vpo bc *ge. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from thp0 *a+5bcouwoo9vsv (e lens. What is the focal length of the lens?

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. w:vnri7e bt7 5 j1hr 9;h/sdyg The lens has a focal length of 10 cm. What are the values, respectively, of the image distance and latera/j nis 5dy7r 79 e;:thbgv1rhwl 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 fronr;9tgk:on -+ zjd yl6kt of a diverging lens with a focal length of 10 cm. t;6 dljo :g+k- yn9zrk What is the image 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 fra2 6+y0rq1uzfpb)rbsp 8oh.zw3zn(aont of a diverging lens with a focal length of 10 cm. What is the magnifibwo3s.q208u )faz pa6z z rh+nrpyb( 1cation?

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 diverging lens. The i:d -crie-q oz9:sw;gj 9twf5dh xlr*5mage is 4.0 cm -w9jr 5g;*dd r:xfoswt:- el9qc ih5zfrom 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 tall, and is in front of a diverging lens. The ig)1w.lk- ull u/by-dgmage is 2.5 cm tall, and 7.5 cm bwl l /uuy -g1g)k-dl.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 mf tbfdk3sh);2* 7bt1v wy)eaof 40 cm from a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on d)2hatwvk *y1t fb s7mf)b3e; the same side as the object, what is the focal length of the lens?

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 length 50 mzr1x dqcdz8 y1*y)q;cmf 1rm:m must the object be placed if it is to form a virtual image magnified in size bxc1)dd1 q1m: ryyrz8 *cm;qzfy 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,zcxd(0ks b w.zg3 1-or such as is used in many 35-mm cameras, must an object be positioned if it is to form a real image mak oz0-sg.xz13(dwb r cgnified in size by a factor of 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;qje 83(egpqqb;w(nn focal length 20 cm, are placed in contact. What is the focal length of thiqnn;pe 8w bg3q q(;(ejs 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 radlx k g92,3fzt r0qvhu3oc3c7bii of curvature 46 cm, and is made of glass of index of refractionqg3 0 uclr3 f h9t2bz7xv3ok,c n = 1.60. What is the focal length?

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 made of glass (n = 1.50) has a radius of 40 cm on the fro iwkw n4+rfafpu00:+jnt side and 30 cm on the back side. What is the focawr nj f++pki w4a0u:f0l 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 using a piece of plastic (n = 1.70x)(zz zah.7il5i bu wkot*1o)s jgx:)). The radius of the front surface is 20 cm and the radius of the back surface is 30 cm. What is the foca ) kboiw5)(zzax7 . ho*txlu si1:gj)zl 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. It0,a zp;m;qk6wd-uj v t is made of glass of index of refraw; - a6qdp0 j,k;zutmvction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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