Physics Unit23: Light and Geometric Optics

1#

Reflection, refractiguloneww l.7m*ii h;70s+ sx:on, and the formation of images by mirrors and lenses has been sus wm l;7i. 0nig *xwus7ol:+ehccessful described 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 incidence hyrs:pgy,e/ b- 8i+zu

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 whic b1 fzd42h.p+lfw;vvt h 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 an image that is hxihndk2fjt5 2*qmk)x 40w2v

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 imags1u hq xwo 8nzt5j7mhd,s6i :2es 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 do no 7e-c18,t e(kyxrbrj st actually pass through the image location, and would not appear on paper or film placed at thaebxsery,87 k(tc- 1 rjt 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 rakw)d4 (zbompt4( zd i3ys pass through the image location, and could appear on paper or film placed at the that location is referred to 4b()dwzpo3tk 4(zmdi 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 imp7+; uppb 1y5bga*ca 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 ou9nd cxy:a+a-x wf xp0h)xpd3; * ow36dnb)lytter surface of the spherical sha xt3 xy ;wapfy*x nd0anxlcbd96)3wod):+ph-pe is referred 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 plau+dx7 eh;ry vc2q r/6qce on the inner surface of the spherr x/dyur+qc2qv ;e7h6 e is referred 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 co; t bwqzkxff-*: 5jsz4ncave mirror is r, the 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 29jzz,ts5xafd8c 3lmq(,e9ha 5 mti uparallel to a concave mirror's axis, strikes the mirror's surfjidacts9, 8zxq3 9futz lm52 (ah5e,mace near its midpoint. After 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 concave mirror on a uml ,3jle c(/apath 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 obliquel- o,b6iypo .f1 4jofxsxp8/ jiy to a concave mirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. After rj.8pj6fib x 4xf,yi -o 1po/soeflection, 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 mirrorf;4z ;esuedz3 on a path through the center of curvature is rezue; z3;4dsefflected

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 oblique jbnk.y9 k/v(fly to a concave mirror's surface, crosses the axis at the mirror's focal point before striking the mirror's surface. Aftek 9kfj (vn.y/br 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 plf6z/ :v+6f:new oznjath through the focal point is reflectel:w ozn n+v6 f:6z/efjd

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 imag7g7*rpdlux .o e position due to a curved mig r.up l7xdo*7rror.

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, nm4k,ofz8q w:exactly 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 d/b h,xf 6m/dmconcave mirror's center of curvature. The image produced by the mirror is locat/fd /6 dmhmx,bed

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 g h(/r3 tzz ggxj9a aetnsl -3+qu416ja concave mirror's center of curvature and its focal point. The image produced by the m13 -/3aa lgznj9z6x egq+j4 trs uh(tgirror 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 con52js4. his+,h1syg k xl ic3x (reaw-icave mirror's surface and its focal point. The image forh gh 3cass5x1i -kx+2irwiejy4( ,l.smed in this case 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 mir8 va re7y2l9w0+kqrw*zltm m+ror, at the same distance from it as its radlw ey tlr09k +7*+qmwr8v2zam ius 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 bk;xkf-oq(q.f ,g3c usame distance from it as its focal leng ;-q kokucq.(b,ffgx 3th,

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 yorwi 9e),)j+j7 d:u+f xgq ; yh;sphthou see a magnified image (a great big you) and sometimes you see a diminishe +xft: ,pd;o;7)y sgqwj9euihr) j+hhd image (a little you). If you look at the 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 mirh:w4e:e t;4pb t6au lrrors 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 produce im01xllabp yh-- ages 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 sphericald92k6c y9mmru mirror produces 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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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex spherical mirror produces an image which othy 1v 2+ x8ac7ndte69 zgx2k(/eh weis

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 magnification for a mirront,oo5 ilylju2cd0 7* a fwu14r 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 is ufnnk(j*92hepositive, 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 d j2v0.yboh;tn-2ju wimage 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 is a positive value, the imau62( nms-ye aage 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 isrenwt/t 66 4u4ivn pp6p,uq 4g a 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 of the magnification is i*, w zynze5n/larger than one, then the image is zin*,5zeyn w/

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 th7f1t r 5ny;4tb;tn ubqe magnification is smaller than one, then the image it; bn4bt5;qn1ur7ft y s

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 magnifice lrl ;ca*t;4dation is equal 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 fasteszh.0rbit*/iqglai 45: tp2 wft

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 indea;+e p bh,xemxle28-yx 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 k* -cnd7ta2z6vec mf6)l-yf nvju , t4one for a medium 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 dgq3 v--czit x;iamond 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 incidenqlgolr+f1- bt5 )e6occe

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 anglkn;arvl2 kbjc6q t402e 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. k w:/x m9ph s 4n(ko4gtbz;-qcThe angle of refraction 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 plate at a b8;5y ik;c cyc(kkvo)$45^{\circ}$ 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 fi5eud 9h/hjq0hz as/h):d bm*gber optics is based 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 beamd5s ed,.9m k(fne2z rz of light passing 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 lm(5fum ke1e; denses 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 ce;hk)dq+hkc jjo8a0sc(((l tve9* hx82fp x u hnter 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 center than the edzr h5qgczyoyp m/6cim +xt+h)d 1:19bges 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 cent+xvw1vp pka*u+7 d:gyer

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 yrzhh:ay9j-3t+ 4ril similar except that lens B is rated at 20 diopters, whereas lens A is rated at 10 diopters. The focal length of lens B i:hzyl+j y- r4i 93rthas

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, strikcsr1a k*re;.f es the lens near its midpoint. After traveling th.aksr frc *;e1ough 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 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 ff*ny ebz3z4f5xv4 a0 a convex thin lens, strikes the lens near its midpby45vf3 e0x4z a*zfn foint. After 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 6qglm4.d: ae fxi/9w+0xzvo udue to a thin lenuel vd/ gx6ax+ :wqmi9z 4f.0os.

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 c12qu:2nn tngta y g03length $f$. 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 foca/uacc hpf2 al:6pu1* ql 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 foca*wt2l0 +qzih fl 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 len21p+jt-wtik.n domd 7 gth $f$. 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 focal length i j zb ;urgtu1e;ex..2$f$. 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 blid jv r,(28ttdy,e)h,x7gz t etween a convex lens and its focal point. The image formed zd,,xtjt i (g)teh2d ,l8rvy7is

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 concave3 ekqtgp ap;/2i:z6t f lenses

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 yocoyi+4) 7rfzfnb7co v; ia(+ ku see through 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 screenqzb:efpcix9 1)de.4l. Between the lamp and the screen is placed a converging lens of focal length 24 cm. The filament of the lamp can be imaged on the screen. As the lens positiepz4db:i.)f1 xleq9 con 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 lengthsoo nie;( dho .fpgp8cezc7o-my(9vc / ut;2v+ $f_1$ 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) lenses are placed in c 1hw s byq;9xtc; ulp7a3es;uh3 -qs*xontact. If each has a focal length of 20 cm, how would you expect thc; ;bxqhw-97ueyx;3 p l 1*hs us3atqse 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 plg3u/)v: h lnd1sx-a trane's reflecting surface with an angle of incidence of r3hlug1t/x v)s a -:nd$52^{\circ}$. 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 fri)2 (p*z rqt.p,oz(vmot h4 mvuv1i)font of a plane mirror. The image formed by the mirror a (.2hp*tzo )rtfi) 1mzvq4vupv(,im o ppears 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 youoo2lkuwfv.kf9h.n 6 ( stand 0.75 m in front of a vertical plane v.h9.2o kok (ulfwf6n 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 approa0q,+h(ikczwfgs :ew 8ch your image when you approach a vertical plane mirror at a speed of ,hk efq0scg(+z:8i ww2 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 ,d)ggvasz 9ps;fc z:9mirror has a radius of curvature of 20 cm. How far from the mirror is the focal point loc )v gc9zfsds;apg z:9,ated?

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 createsuku;x8zll/ a2a z0;(gwq a2pu a real image 30 cm from the mirror. What is the object distance?u pzu 2/ala8ug0 z qk;l2xwa(;

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 qqh9ukio0 ay;3b1lkuf *xd.9 b c 8fi9the image is 3.0 cm in front of thek0 kbuf 9h3qloicaq ;i f99y18u.b*xd 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 miryrgh15/ut: tb ror with focal length 3 cm. Where is tuyr 1b/tth g:5he 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 focq 4lab5h:1pzp bc(itu9 e g9mzqi:.x ce:s g/7al length of 20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where guz( e:zq9/sbclp5 i t7 9hai:qc1pbxe4g.m: 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 asa 04u ic8vwh35)bpfmirror has a focal length of 20 cm. An object is placed 30 cm in front of the mirros8a)b 5vic0 a4uw3hfp r on the mirror's axis. 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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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 mirror. The image is 4.7 m twf0j1ngx7wszy: 9 ,cm tall, and 10 cm from the mirror. How tall is the object?n7 0tzw,mj1wg9 :fys x

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 concaveq n1.95j4 x ut3j zf0m:u hlpg9zjesf( mirror of focal length 20 cm. The objectzm flsxf19 zu5h9qn jj u:.te g0p(j34 is 4.0 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 the mirrd3ur7eiq8/xea 2 g/onor.oegnxd/i / qau72e38r How 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 c*aw rh, 3jwjtg,:4qduz: zfi23aba9x m from a concave mirror. If the image is 4.0 cm tall, how far is it fr:r,i*f, wu qd gxz2wa9 3j:a3ht a4zbjom 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 z( vdb : b7c(;bga*ovdam6m)mcm from a concave mirror of focal length 20 cm. The object is 4.0 cm tall. Where is the image locaadv:(6z c( )vm;*oba7bgmbdmted?

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 (concaveh uf8y4yhxt-+ mirror), the erect image is twice the uy+ xh-fh8yt4 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 mirror. If 6vi ys 0tj*i+yie;x(m the image is an erect imag tx0ym(6ev*s+ i;jiyie 1.5 times as large as the object, 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 da-l 78m:f1si2l 9o89: paurjinkvld.0 cm. Where is t idm8-9 :d8uj apav r9ol1slilf72k :nhe 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 hap;9w;eemg ab1s a focal length of -20 cm. An object is placed 10 cm in front of the mirror on the mirror's ax b pgeeaw1;;9mis. 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 -20 cm. t5x51dprx skd8zc5v1 g9p fs) An object is placed 30 cm intk5sr )d vfx11p5 5c8x9p dszg front of 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 fron*dp.-xx a v(n.9 3 vsanjfqm-yt of a convex mirror. The image is 5.8 cm behind the mirror3svfd x n jav-9.-na.qy( p*xm. 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 ta((;h8msubrqq ll. The image is 7.80 cm tall, and 14.8 cm from a convex mirrquq(r(b8; mshor. What 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 refractiofgadwg8 u2 .a:n of 1.50, what is the speed of light thrg.w2 :aa u8gdfough 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 glase5jpj*s:8 yr 44midoy a3r7 9eql 80swtbapm7s 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 at t82 avxyxip0; 9cy8f3s-pl v ean 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. Th pn3,g0lvgv 3a +u. wcl*g4mzie 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 evoq0wl4w7m4 rgklvpb w0 20.pg enly over the surface of water on a windless day. What is the angw 0wb4l 4.ov kwm7l gqp02rg0ple 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 beneath the surf o; q;-61ftcfdxl. 1d4w*iwosbzeoj(ace 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 refraction for w6woi; wz*xsl1.ct(qe job fd-;1f4doater 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 at 1 wg8en 1ba2r )uvtz5w.27eaeh2vye plate of transparent material at an ang t22)nw 8ev7 2eyvt1h wau1z aeer5.gble of incidence 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 traveling in air is incident on a slab of traq*apxajl w9x*ghcrw q *0c73u.4e hop. als+1nsparent material. The incident beam and the refrac*aq.w.u*ox+ lps0hp9*1ha qw gaxr 74 el3ccjted 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 oo41j1h0 ;thksgx5u r zf refraction of 1.46. Light is passing through it at kxr5zu1;j40ho 1st hg$53.0^{\circ}$. 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 tr0o 5en(k* x*/llp;r. aa*nornjy ; knpaveling from crown glass (n = 1.52) into water (n = 1.33)?o(;aep n50jxk on*y*p;na*l kr / l.rn

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 refract0beshnx 1z mq6.kt1v6)ai- goion of 1.50. What is its critical angle of incidencmk)- b 1x1av0tesgzo n h.i6q6e?

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 with index of refrac;pvqt(: v+kzgtion of 1.50. For what angle of incidence will ligh(kvgtp:zv+q; t 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 a subst.80:wh2frzh(cgxyu cw m3 -0tw kdeg4ance 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 substago/ir empq8c2.2hx 9l.-khfk nce from 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 long and has a dqtb1 ;6. l ubyvg)lj8ec0*l5mbudd7x iameter of 20 mm. Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maximu8vb ;lulyd)5 tb. x7lcu1e* qgjbd6m0m number of reflections a light ray entering one end 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 in front of a 20 cm f ,gx(u-ovjp:60o (0h*xycx,xlnvn hhocal length converging lens. How far is*vln,0,xxyoxc: ujx h o(0 phh(g-v6 n the image 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 fod;oz09 2v bems0 8jlmxcal length 4 cm. Where is;x0bmm82s ol vj9zed 0 the image?

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 the imaguqhl0 s(5 hnp8e is 4.0 mm behind the lens. What is the fonh0q(8uhl p s5cal 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 converging lens. )zxadwj,5ij l5ggl mxq(3 -h7 If the image is 4.0 mm tall, how fxw(g-7 ix jjqdgh,5ml5 l)za 3ar 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 pgx.q rt1 +lp9inverted image is half the1xt.+ rp pqg9l size of the object. What is the focal 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 wikevy549+r8;6bjea2c63okeh9 er o rasan d/g th focal length 5.0 mm. Wheregkk6rrja+3bn/edh9ea 9e64y e asr8o2cv 5;o is the object?

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 qlg;bq2ceejv: hbb y75;v; 1 ajyp/;d10.3 cm from a converging lens. The image is virtjdbbeyb c21l ; :;ahp ;qqv;jyv5eg7/ual and 6.2 cm tall. What is the focal length 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. zk.v oebm/e 9/ The image is 4.0 mm tall, and 9.0 cm from the lens. Howv /e.o/kzbem 9 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 ft+k)gusu.difm :yz, 9r)h :t jrom a converging lens, it forms a real image. When the object is moved to 40 cm from the lens, the image move9 iz)mdk+yu ,.) g fj:s:ttrhus 10 cm farther from the 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 fr -volbf 1;/ *p)qqb gommvyn)9om a thin convex lens. The lens has a focal length of 10 cm. What are the values, respectively, of the image distance and lateral magnm1lo/f y-bbgv v );9n m)q*qpoification?

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 with a fu g5oa *po4q7focal length of 10 cm. What is th4f*q 57oouag pe 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 front of a diverging l3r hz 7jlpde.v*m 8lk(ens with a focal length of 10 cm. What is the magnific7emr8(k l3jh.lvz *pd ation?

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 4jkmo 4 g2k0nm tlt/zdn s1(xk7wy)4 i..8 cm in front of a diverging lens. The image is 4.0 cm from the lens. s n27 xnzmwik( 44jok.0/ y1ttdm)lkg 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 divergin3rasq1.v/:/ah ur a9) rlwvgh g lens. The image is 2.5 cm tall, )/s hra1r. 9ahqvv:/3lwuag rand 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 f+a6uacw)x ox 5hb myoe,i;:;m rom a thin lens. If a virtual image forms at a distance of 5w+ )o;:a;xx ayb5mheo6u imc, 0 cm from the lens, on 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 6lpj/xp bb/g9 length 50 mm must the object be placed if it is to form a virtual image magnified in size by a factor of thrj b69// plgbpxee?

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 fond/v6m hxefah;84q 2 kcal length lens, such as is used in many 35-mm cameras, must an object be positioned if it is to fo 6e24;md/ afh8nkv xhqrm a real image magnified 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, ea.97 ofvmrquq3xit 6zxxw 1,1nch with focal length 20 cm, are placed in contact. What is the focal length of thisq 1v7ow, x19xmzi qn3x.frt6u 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-convjqn on4;zr 9w-ex) thin lens has radii of curvature 46 cm, and is made of glassn;q-or 9w n4zj of index of refraction 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 ra: kdcjjh/// )idbyt6ndius of 40 cm on the front side and 30 cm on the back side. What i /hjj/ndd/ ty b)i6:cks 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 u2wt0o u ttg+b*sing a piece of plastic (n = 1.70). The radius of the front surface is 20 cm and the radius of the back surface is 30 cm. What is the focal le 2t*tg uwo0bt+ngth 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 -)k;lpqpx,z)r y6 e 8bquky g9a focal length of 40 cm. It is made of glass of index of refrpl ;be8,9)zr g-yyk6qx ukpq) action
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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