Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of imagese) dufb77cy c-yk )lv3jf0u y3 by mirrors and lenses has been successful des yv ulf) 70dyfk-j3ceb73uy )ccribed 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 incidenc pqvvo y y) 09jxyq-a5r(+7cqfe

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 mirrors t.v9v /vwi q)(i)nlqa 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 t,p wsb72nm4bb k+ 16 yim;gocimage 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 w kzdq0 v /x,7:wnay/kghich

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 lighgu5 rqzohp851fp 0qbkl h :n557r, xyu1ple-gt rays do not actually pass through the image location, and would not appear on paper or film p 85kup:fq51gp,gh7 p-0qnry bu5zl hl1er ox5laced 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 f u3 2 2i4ko3+r9abd3reldcrwcould appear on paper or film placed at the that location i3b3oucrde2ik 42 f9a3+ drlrws 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 a virtual image?/ tc,t 6 .hpd1sd7 c;tryzpo-bs mi2c-

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 .i;d+zl lymt+place on the outer surface of the spherical shape is referred to .y++ imzdtl l;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 xb(7jv4+f6 oo+dke t- j:jvuy inner surface of the sphere io+ b d7v uev6-kjotyjf+4(x:js 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 concave mirror/xt3f2g6tja9 bd1s wh 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 parallel to a concave mirror's axis)n 9wvt6 36mmaom,waocd* b2l, strikes the mirror's surface near its midpoint. After a lmd*n3 omwao2mb6w6tc9,)v 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 path parallel m9 mejegn(gs8*w wwp: ; i)qt5to 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 concave 6u5lwiy um.3l mirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's s 3l.l u6ymwiu5urface. 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 mirror on a path c ls obj2p:/w6v*1pm5gk+zvb through the center of curvature is reflectedvjzwbb*6mgpkv/s5l:c2p +o1

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 concag7ba powl, di--aqy6w2* ls9vve mirror's surface, crosses the axis at the mirror's focal point beforwoq sp,widl-6 l9 baag2-7y* ve 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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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 rw+ 45ag6 p6*a gp6ggbcjhc4a path through the focal point is reflectea jgcph4acrgp6gba5 *4 66wg+ d

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 image position due to a cu6z*cl7n y +j7tza j-zwp 2zgj,rved mirror.*cgn+zyt2z ap,7- w76j jjzzl

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 hxve 0w* ve)/y2qb gwj3+ 2pvd-umu i,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 l (o 5uxg2eo 7ewl0 oxj:qae69at a concave mirror's center of curvature. The image produced by the mirror is l(wj6agqx 29 e5:xe0e o7uo ollocated

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 mirror's center of curvaturej:yl olh 26d 7+c)mc2aswn*ww and its focal point. The+2wo:*cnjyw6ah ldms )l7 wc2 image produced 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 xe0l v7u yf,p+8xz gz*a concave mirror's surface and its focal point. The image formed in this case is,xx*+ 7fu 0v 8ypzlegz

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, at the same distance from it aai,3y gkj:7h( egoj e iq 4,2hrdvm25rs its radiuymh:ve3ig,,dq rhk e2ji7j g42 5ra(os 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 :0 nihg5s+dmb-eoq xx4zm).w1 g zb 4othe same distance from it as its foca)e5-.z+ wmnzq mbxo 4hdgxb0s : 1ig4ol 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 zj2l(vj+f/qt c08h-l8dhr jp a curved mirror you see a magnified image (a great 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 willj0-l(pthzjl/r8c f hvd2j8 q + 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 mirrh d 1b,jd9y9t ky8d8hlors 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 imagegzj+9 4ccpg- ks 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 spherica 3e+lnl8l5m*ael z.,sdlvt4 vl 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 kz12 b)m7n(sp*a :nrhp2yqyk 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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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnification for a mi(3wx8gy0t1hooke; h6st er u *rror 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 positive, the image f ,7vbczu;ju u9ormed 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 istd+p+a79mxr*u0 k jc iuy9 rw: bps8pb.i. 7lm

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, nc65d :sym-r3o ekuf)9g fd6 ui,h-urthe 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 negauz1kixaz v cpmt7m1+ y7gu3yy5,*qd0tive 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 magnifi+ c1ml2yj1rtf cation is larger than one, then the image isltmf 1jr+y2c1

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 imageq9(e( f71 qukrx n5ogj i1ueqkrjx(7 fg o95qn( 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 magnification is e1b ct. rih7-3 4trognjqual 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 fastestg wcs6ylde ;-u+-4 xmf

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 3 g et2;kakcm/material 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 c28pi1hzuq8q )ihx)u q2e fc/6zbqp4 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 k32o ff a-hf+rof diamond 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 incidencrh44 r7: onms4- yoqlkri), ize

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 a denserzbh m6 aklk/-b.zg3m7 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. T (*hj m ggqv.lkqog/;2he 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 gl3y t3*zpqj/d lass 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 optieu/: g9km+k go+wem c*cs 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 3ios* 0+11d2iazy rdi/igpv a a beam 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 lenses wor4gsqco)jz wjq d0 u(5vovul3gr2s 8()k 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 cqdiwmwqsm 10x7y1 : 9kenter 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 v+chb0 1alt8y the center 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 cdbow +2b h*pi;tqx: a-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 lewk :l8 ltry3oq-3 mlo3ns B is rated at 20 diopters, whereas lens A is rated at 10 diopters.q8oyl-:ltrkm3 3 olw3 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 p6:s(j.cx bnwyv4b4 cdou7x . darallel to the axis of a thin concave lens, strikes the lens near its midpoint. After travelinddb:wj ocv4xn 6c7xbs(y. 4u .g though 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 a hsj, r0mxp 6y4 hd5 d.pj54cyrconvex thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emerges traveling obliquely to the as dhm0,rd6xcp r45 jj.y yh5p4xis 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 m vigitrv,b v8t8x206finding the image position due to a thin lengb v08ttvm8,6i vrx2 is.

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 lengt2cpn9v)mj v(p h $f$. 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 leng)e* /ymw7xwl snai/ +lth $f$. 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 lengthm;vvlu,xi k *a*9i:wh $f$. 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 lengt * iksxdw++vkwek, (5xy ;co-lh $f$. 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 lengt 9kp0nzdmh9: fh $f$. 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 le5e -je:ue(fna6ynl u d3g3fbql-keu5.i6. ff ns and its focal point. The image formed ij6.-ed.a e n ui-b qy 53lf6elunufk3eff(5:g s

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 lea8a l ( yg54q9e9uo ybl*pozgqv,z9 5hnses

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 through a magnifying gl ur08d8;+;peor3cdzb )n tlgr ass 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 screen is pl(n6wbn halg( 2;7ovfdaced a converging lens of focal length 24 cm. The filament of the lamp can bevn ag2nd;76 (fhbw (ol imaged on the screen. As the lens 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 focal lw/eguf 8vnr 2a4 c+,tjengths $f_1$ 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-convexlbp;f.hird r 6z 6w0a6gm56cy i( k2ll (convex-convex) lenses are placed in contact. If each has a focal length of 20 cm, how g5l6iifr r0w6 l6pamk6(hd ;blc.2zy would you expect 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 reflectin,* bg oqa 7yinc8-p cgaw(g8+/q a.lykg surface with an angle of incidence of g7l8 gc,.ypob (aqg q-/w+8nkyc aa*i$52^{\circ}$. 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 a plane mirror. The image formed b1aou/st v7 r*kju8 .c7 qft h,o6n0 2qoyn2bziy the mirror a oqvt.8*q2tn,bj 6a/70yiuk21s ur c honoz7fppears 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 youoe6x1huptof2 + p-h+ar image when you stand 0.75 m in front of a vertical plane mp h1+fa+e62-op tuhxoirror?

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 image when you approach a vertical plane mirror aw slfo.gi dz. /tol x zq3i.h8*dp6-c6tdz-*.o xwgz st .3lipid l/6qofh c86. a 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 curvature of 20 cm. How far from th m7i*kwv v0cwa5m7b,oe mirror is the focal point *mk7va7cwmoi05w , bvlocated?

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 c;v v 1 w/dcu6bl7o.kjgm creates a real image 30 cm from the mirror. What is the object .b ld7v/;1 v6okwugc jdistance?

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 im y/7vom qrr9;mage is 3.0 cm in front oqvo9my rr/;m7 f 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 r 3wl jdhce;0pbrg 66em/:)hqof a concave mirror with focal length 3 cm. Where is th6 jer;peh6rl d3 mq/h0 w:bg)ce 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 jeb ;-ypi+l4m rdf 1pk5r j*w,r o,im)cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the imajrm;yrk4 m 1fii5we opdr+ )bj-,*l, pge 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 lengtq o;-r3v-o qihuos,3 hh of 20 cm. An object is placed 30 cm in fronu, qoh33-o;hov iqsr- t of the mirror 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 cm tall, and 10 cftjz-he6c ec 27r 1d/em from the mirroretz -crcfeje/67 hd 21. 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 cm from a concave mirror of focal length 20 cm. Th krw (bp8napdd1 os+bu;f;z( 9e object is 4.0 bp fsupnr ;zd a+ 8k;1(d(9wbocm 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 14.82kob k2ml-ucu1ywh; + cm from the mirrokc-u y 2w1+;lmo2b ukhr. 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 cm from a concave mirror. 7 v*lqblme)liae ti 4 1wn))i5 If the image is 4.0 cm tall, how far i1lam b))q)l*e i 4w 5lvn7etiis 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. The obsnm-h+u 8 m+mic43vdm ject is 4.0 cm tallimhm3 n-md+ mcu4 +s8v. 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 osy6+ )v/gmqv y3i 4eyro:mnp2 f a cosmetic mirror (concave mirror), the erect image is twice the size of the object. What is the focal le v:4 ns3/rgoyvq+me6 iyyp2 m)ngth 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 fro7zler uzls ry ms7x;( -6q-6ncnt of a concave shaving mirror. If the image is an erect image 1.5 times as large as the obr 7rscu(m76l lye6q -nz;zx-sject, 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 fo scxv 4;+.jph ljm(1bkcal length 5.0 cm. Where is the object? xl(cv+ bk;m4j 1hpj.s

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 l. ju,.b1 nphk7lyu/.uwebo* xength of -20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Whbu.n,wyphbkj e/lx u.u 1o. *7ere 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 -2ft/u :x3x)qjz -ldrw01s (zyh 0 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Wherex(uxy13jz wt: -zs/h ql0)fdr 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 mirror4zubmzu78v8rubb 8l3 . The image is 5.8 cm behind the 8blz3r 8bmuu vu78zb4mirror. 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. The image is 7.80 ;5p1 tvmxvfr0cm tall, and 14.8 cm from a convex mirror. What is the mfmvr1x 5 0;vtpirror'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 refraction of 1.50, what is flq9c3mns0q:+3t ke h the speed of light through it? s m9kh3qt3n0l:eqc+f

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 ist l;wwsn x)yk( thcelj,9;v(; incident on an 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 at an angle 5or7jyc*3sf xof $32.0^{\circ}$, 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 rase5 ,n t: qlqabc863mpy 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 e ; *vfh,.fh 7:dg6us8ydi koxis spread smoothly and evenly over the surface of water on a windless day. What is the angle of refraction in the water for a ray7yhx s i86ovdh.f du,e; kg*f: 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 beneatds uhi t,f7o9em*6e 0rh 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 refraction for water is 16s* e r,de0iu 9ftmo7h.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, edb*eo7ak)z:6 ;; d1g1 h jmz ckffns.strikes a plate of transparent material at an angle of ine okmjf1e)ca nkf6g ;ds;hzb*.7 :1dzcidence 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 inci+ qe+nio jrzpgrj1+ms168jt 5 dent on a slab of transparent material. The incident beam and the refrjer+pm68+1jg1+ r 5zs jtnqi oacted 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 +pthv7 8u5hqhad l;ihsg m77+/sp k7lpassing through it at g/hvt7 m+57ahhl+7qs8 p d7uls kiph;$53.0^{\circ}$. 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 aneh0ep;z6i3 l ;rp-un/ tc9kh ygle for light traveling from crown glass (n = 1.52) into water0/ eunt; -9i;zelkc y36hh prp (n = 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 of incideys bw4 s2 y/m8k7yjc2zn42ybyc 8yjmszwks2/ 7ce?

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 refraction of 1.50. nx1y ivxtaq *y/e9bc nsy+c.zp7 )4wx)tp59fFor what a9sx5+y1*/)bx.tqv ccxp)n ei9 7fy pzwt yn4angle 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 a s 6o1nw/cu ifom9 sa8-kubstance 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 frad:sufoszft h6w:*-8 om 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 diameter of 20 s 7o9vvd8oi9f mm. Its ends are perpendicular to its axis. Its index of refracd8 7sv9iovf9otion is 1.30. What is the maximum 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 cv lq9jth*16p cm focal length converging lens. How far is the imapq* 6l9t 1vhcjge 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 frof gn235huqwyz:*jxn 4hty1 r 9nt of a converging lens with focal length 4 cm. Where is thr42y htz*gqu5 :nf3xy j wn91he 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 image ie 03s8kcivzwmi / e,:zkqc/c k3w3n+qs 4.0 mm behind the lens. What is the focal length of 3q +i3 n/wz vck 0csqk/ec8z,:ei3kmwthe 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 conveo(3) tmvs 4 lfgwl;2djrging lens. If the image is 4.0 mm tal) wvgfo(3jsl4 2dtm ;ll, 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 im)lmx pswz7/ g9w+fta3 age is half the sizfz+x7 w 3wta/g)mslp 9e 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 with focal lenn:h c ngd(0gab85fyocv2 kd* 8gth 5.0 mm. Where is thh 2vc50:fggak8 d*dnc8n by(oe 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 10.3 cm from a convergingpkv jxse*n5/vjn,(u13 dxw0 s lens. The image is virtual and 6.2 cm tall. What is the focaln 1 xxk0un* p5/vd(sjsjvw3 ,e 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. d2*rc:2 e qi4chb yns7 The image is 4.0 mm tall, and 9.0 cm from the lens. How tall is the enc*rbch2 diq y4 :2s7object?

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 . h7fe sacdo0), b9gd p78ydhkconverging lens, it forms a real image. When the object is moved to 40 cm from the lens, the image moves 10 cm fh7.b hd)opkdf,9ce0gs y7a8 darther 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 abq/5sy4p (pgg distance of 30 cm from a thin convex lens. The lens has a focal length of 10 cm. What are the values, respectpbgyq(/sp 54 gively, of the image distance and lateral 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 *w3k: 2cn;e znw *x0:hyrxyxra diverging lens with a focal length of 10 cm. What is the:ye2*;r:xr czx 3wyhk* nnw0x 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 lens with a focal le2ye ec/l/ qrm6 n.70jx:f(z3tpk qtaq ngth of 10 cm. What is the magnif32zem76 cf /xt 0n q/ :yqq.jltrpka(eication?

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 +:, 1lh1j/n dncd reh3rg+fz8pero3h front of a diverging lens. The image is 4.0 cm fro3n:cerg1d 81 drnlre h/+ ho z+3h,jfpm 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,z*qzyr osmob-givg, 24u(c7 / and is in front of a diverging lens. The image is 2.5 cm tall, and 7.5 cm from the lens cz y(*7b g2vu/zo-m r4qigo,s. 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 ah35)efunf ,t2wmr29xq td 0iw thin lens. If a virtual image forms at a distance of 50 cm from the lens, on )dq0ne2 thw 9u i2m,twff53rxthe 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 mm must the objeqj 42zx1 c6jvrct be placed if it is to form a virtual image maqjc6rv j4x 12zgnified 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 used in many 35c(x2s, 0df rko i-hj;( 1vewsn-mm cameras, must an object be poo( i 0s2cv-k;e(dn fw1xjhr s,sitioned if it is to form 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, eachik h-gl*rc4 m- with focal length 20 cm, are placed in contact. What is the focal length of chl4k mg-ir- *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 (conve hwlgu3n*-3d vcjc9y.x-convex) thin lens has radii of curvature 46 cm, and is mhlv3jc y* .3n-ucwg9d ade of glass 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 radius of 40 cm h7ana7-qgv n gm;3hq5 on the front side and 30 cm on tqana7 hhqgg;m3 75n v-he back side. 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 usinb6c5ef- ym2 glg a piece of plastic (n = 1.70). The radius of the front surface is 20 cm andyf5 2-me6l bgc the radius 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 tvpp ;yu) x0d8la*vww9o,k /c so have a focal length of 40 cm. It is made of glass of index of refractio,;vs9wd /uk px*l w0y opc)av8n
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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