Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formaeuna. 3p*o 0zltion of images by mirrors and lenses has been succe np. 3zeo*alu0ssful 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 incidencpn*;)dv d8 )5av mhk;4q gscsee

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 mdhz c;6)ou e8kirrors 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 thml a:3(a(r yd*6p ymbr+:jlsq at 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 w98csi/lyw /.uy nc8hpg.ptwr)6l 0mwhich

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

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

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays do not actuallyjt4d w60x ,bb m9fss0e/(tjs-5 j ojfo pass through the image location, and would not appear on paper or film placed at that location is6db4b9 0tw osj0jsfo5(f je m -txj/s, 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 thr:619xvye1fhd*aqjq+kss:fq0 mjlz : ough the image location, and could appear on paper or film placed at the that location ij se:*s91zfq:a l+dh1m vfqj xy0: q6ks 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 i55)ku)y cfb svirtual 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 whicuse 7cn 14auoajj09qyxr- n(; h reflection takes place on the outer surface of the spherical shape is referred toeaur7n9q 1 -su(4yjxa;cjno0 as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the inner snc +h;tjw/mxxs* u1c:urface of the sphere is referred 1cnms w /x+*c jhtu;x: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 curva;op5y5 7 ibr clffjl+7r(dgo8ture of the concave 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 parallel to a concave +a80nshf:g0ccyg 6fcme3 d/o mirror's axis, strikes the mirror's surface near ioccfmy0: nh /g+c dfsega8603ts 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 mixm.i/udk drb3 il7;6muq*8n ,z w0ueirror on a path parallel to the axis is reflected

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a concave mirror's axis, crosses 5n 4zylfev 5 /7)b)kcrd;j cwothe axis at the mirror's centlbr574vjndcc;e /5 z)ow) kyfer of curvature 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 mirror on a g+r antca)lss(7/ )jbpath through the center of curvature is reflectedjst nb +)lg/a )r(c7sa

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a concave mirror's surface, cro ( 55zutsd1chcl 36zeqsses the axis at the mirror's focal point before striking the mirror's surface. After reflectt h( 35sqeu51dc6czzlion, 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 refle5x i :eb75 rnyan4z*,pcpbfa3-xa0 macte a *axiyz :men0 4-r5p7a5pb3xc ,bfnad

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 find+o dpf* l /e(ld.wa/rding the image position due to a curved mirrdf*/ra d wpe.o d+(l/lor.

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 its69 q bycrgvibm,l-: u. focal point,

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

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

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

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

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

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a concave mirror's center of curvature. The ima 6t(k4;fbudolfo. 1mxge produced by the mirror is locatel ( 6mfdf1o;ob4t x.kud

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 positionedt +9(rb *aqu(5 ehv1wyv2nh+tla7kxr between a concave mirror's center of curvature and its focal point. The image produced by the mir k9 7 +t(bq(uht2axewlv vyr +*r1a5hnror 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 miryj8rcr-7wvg f6:c(k1w s+(opvc-fca b l5zh ;ror's surface and its focal point. Therv;bp jw(76:rs5 1 ca k8yvzoc+ fflgch(c-w- image formed 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 ifw-o wn:8zs1 a convex mirror, at the same distance from it as its radius of cur zf1siwn-:8o wvature,

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 dista2 kkq zxn)wq y9m3 ru(d fx+9c,9eno3lnce from it as its foc 2)x ey x3qq3nnk9or9zfud, kc9wm(+l al 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 into5t3 s;eps6;;n9,mkme nsifi t,uaxd, 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 attpxu,ks6 dmm nes,ts;;, ;5e 93nifai 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 mirrors p +tgzv+ds2flb7zd k5 ff*.1q,p1 pojlroduce 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 imagedq,msai acn :4mu-- 9bq47fhqs 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 whichhhi p/kks ul 4qz7.+d: 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 ive5ff4k ,s zi2r4 bjz4mage 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 magnificatio1ad6vn 5,xk n4drg2 pfvcf4v3 (yue;d n 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 is positive, the image fo36ee+vx01lma snohp -27+mjcfvu y :grmed 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 for s8lyg isc:-+,,ks ocrmed 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 pol/al 0 8sy,izr:,p :ftdhn(iksitive 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 z3t/,j i1n/afmvna6y 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 valu6)utks tm:izc*+rx/ce of the magnification is larger than one, then the image iscsmti )kru/z+:t 6x*c

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 mk tudl0m78qxbn a51h0agnification is smaller than one, then the image ilkbud7x 1n8t5h0a0m q 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 equal to one, then the image isb.jm 0p(rs 5fdf5ws6u

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 fastesti)kb6,g;b renayt:.o

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 materialp d :+cihl(ltfrkf-8) 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 les.,rbu+jvqrtq u/;88li k f+ns s than one 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 diamod akmmi+-w3r7z ;n6a 8rr)wqj nd 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 incidencwd6xv i: r(nb)e

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 1a1semo)3t n.b 8)cq h:dic wldenser 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 refr2*.ph v8wkzrcaction 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 plat eae8wfl66z5ce 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 whihd8z) s-f u0xsch fiber 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 beam of light passing from water lg0 -otqia8)c 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 )b1+ j(4pl,vnrx4dkn.sa wo lwork 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 thickptk)2a(n1ajf4hw s6l ak 4)aeest at the center called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thinner at the center than the edges araf.x0+2z e qsxe 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 centzabr+m6bkb9s/pu7 j64cfw - ler

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 is ra2 qc 7qzb/irfyfz:h db)4-x7pted at 20 diopters, whereas lens A is ratedb 4dhzfq- rb 2)/if 7czqp7:xy at 10 diopters. 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 *hq-i:2 z xzruaigig675 9d2bnm k uylu)p8y( axis of a thin concave lens, strikes the lens near its midpoint. After traveling though the lens, this ray em qgu:y*i72lzbk2 uh9m8yn )-u(dgazp i5x 6r ierges 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 tc)xa+yc/ sx0fhin lens, strikes the lens near its midpoint. After traveling through the le/+fy0cs a)x cxns, 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 ray0q3 tuuv4yr59kzock *:wz0vnicu4) h s for finding the image position due to a thin lenv9zni0oru 0z:*kvuhk qcy t 544u)c w3s.

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 length qr7ycx*a7z 7n $f$. 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 fod2yt 0 m5amts0xa21l qcal 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 fo)hvat3i,dg / 4lo6sgfcal 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 leng7ed 5i5vwt ;*ejxa ny2th $f$. 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 len5+cu ,68anz fj3qavp3 yu +mpcgth $f$. 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 betwib*xv-y -lr 3 26jckl9n7 rrmeeen a convex lens and its focal point. The image formed l2iy-cem63lrjnxvr- kr7*9b 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 conc.dpmu i:n*9 y*hnfmk4ave 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 e.d -f)q gyy):nqmp(i ,ta oe5you 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 screen. Bjq/o:q m6 (hkletween 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 positiom jqo(klh:6q/ n 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 lengt2++rkpgb1/bee d0t g qyoo+g1hs $f_1$ 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 i44zh)phxq y+u n contact. If each has a focal length of 20 cm, how would you expect u4hpz x+)qy4hthe combination to function?

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

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

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

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

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. converge.

B. diverge.

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

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

E. will travel back toward the light source.

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A laser beam strikes a plane's reflecting surface with an angle oy 5p+jje3g3f3ix3y acf incidence of fyip+xy j3j3ea5c33g $52^{\circ}$. 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 5ar5yh4 ;elprplane mirror. The image formed by the mirror appears to 5;aer 4hr 5lpybe

A. 1.3 m in front of the mirror.

B. on the mirror's surface.

C. 1.3 m behind the mirror's surface.

D. 2.6 m behind the mirror's surface.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far are you from your image when you stand 0.75 m in q lbz yb3 hhfy+q5z+i--)ri9t front of a vertical plane mfz-hy )l +-9btr53 ybzihq+iq irror?

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 7r+ 90gxadct0 bfwh h5plane mirror at a speed of 2 m/sx0r7g9 d+wc5a0f bhht?

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. c mtbi v3gbg1,,aoik*.h c *n5How far from the mirror is the focal 1o5,*ivmba.k,i*n b3g tc hgc point located?

A. $10 \; cm$

B. $20 \; cm$

C. $30 \; cm$

D. $40 \; cm$

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave mirror with a radius of 20 cm creates a real image 30 cm from the m*f.usa ioq o20irror. What is f*u. qoao02isthe 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 4,; ar/plpqi whvopt5.;o2hnthe image is 3.0 cm in front of the mirror. Wha5ppn;.;oi,/2 h vrw4pqlto a ht 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 cimq4 p4b k1tjlp8d g:q y(w0s7nw1q3boncave mirror with focal length 3 cm. Where is the imagegj 11 (stmd7q pblwq q4i0 nw:4k38pby?

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 iyd 5nkh)73nami*u/ dh0 usca.s placed 10 cm in front o7 ynhuc dsh)3mdu5* /0ank.iaf the mirror 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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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 ob dohb/ojqo5dr4(xuiq5(i k)n jc7i+9 ject is placed 30 cm in front of the mirror on the mirror's axis. Whnb5i9oj(q hxd(/o 5i7od )u ji4qck r+ere 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 c0t 5 c4mm*vdsbm tall, and 10 cm frdcbm5tsv0 m* 4om the mirror. 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 mirrorym .-- - dl5ie-wgpgrv of focal length 20 cm. The object is 4.0 cm tall. How tall is the imag---iwe.v pgdrlyg m5 -e?

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 cp cxrvlbqq1muy66, ipr3((31 olg:j j m tall, and 14.8 cm from the mirror. How far is the object from6uoq 1qibj mrx,(:pcl g(v1j3r3py l6 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. fcsvgdjw0g1) g 2sid;6(vlx8 0 cm from a concave mirror. If the image is 4.0 cm tall, how far is it fr)6 (vjwg c1 ;g8fsi0dlsg x2dvom 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 200ccwmm 8rg0z *j)c4wqh u,5ya0zsx w:+mci 1z cm. The object is 4.0 cm tall. Where is the imagwswzmrz +4g00i*z,qxym m: cw)a 8uj 1c0chc5 e located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 40 cm in front of a cosmetic mirror ( c l0mgl/u 7wg6 o63:1uxepi7eiz lnqnw-(k :jconcave mirror), the erect m:n e1 lnj76ul l -7upxe0i (q:ciggo3w/6kzw image is twice the 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 g)unb+k6co k.o:v)j/y nolw.a concave shaving mirror. If the image is an eg:kwlnvk6 ooc/o..y+)n u )bjrect image 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,phc gc/ v 3g3. u jltjq(5mwpmp,v38k;iza2r with focal length 5.0 cm. Where is tprg 3 c( , uvjm3lp2 /vp,. 8khazcgm53qiwt;jhe object?

A. 2.2 cm in front of the mirror

B. 2.2 cm behind the mirror

C. 9.0 cm in front of the mirror

D. 1.0 cm behind the mirror

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focal length of ex 4ykz( a*us (ia6c+o-20 cm. An object is placed 10 cm in front of s(zeu(ya+* coxki 4 a6the mirror 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 ovo 3imrd vqz vt3q4 )/jp7,y*uf -20 cm. An object is placed 30 cm in front of the mirror on the mirror'r)3* /dvujtqv 4zvqim73yo,ps axis. Where is the image located?

A. 12 cm in front of the mirror

B. 60 cm behind the mirror

C. 60 cm in front of the mirror

D. none of the given answers

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 14 cm in front of a c v9auj h7l96h;7j brgqonvex mirror. The image is 5.8 cm behind the mirror. What is the focal length of t9h7g l6bu9 7a rjhvq;jhe 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 nl 5+9k zwl ka:52bbdo7.80 cm tall, and 14.8 cm from a convex mi zo l+ k25wnkl9bdab5:rror. 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 refraction of 1.50, what j (ea62ex,ncvis the speed of light through,(ej n2xc6 eav 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 interface at an angle of 6mky*87eu7lydt -l.z vw8p:4q c+p. xeccdle $45^{\circ}$ 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 substancez aj2c0.vns +*vj1kwd 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. yomvb ha/p9 ii0-,94 dvt2rd g The incoming ray is at an angle of $17.0^{\circ}$ to the normal. The index of refraction is 1.33. What is the angle in the water?

A. $22.9^{\circ}$

B. $22.6^{\circ}$

C. $18.3^{\circ}$

D. $12.7^{\circ}$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An oil layer that is 5.0 cm thick is spread smoothly and evenly over the su8zue(nn6b5auxy2(9ahyk hm: rface of water on a windless day. What is the angle of refraction in the water for a ray of ligh2yu8 ebkn (un h6h(5x:zy a9mat 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 benlc i5)u*yig t)eath the surface of a still pond of water. At what angle must the diver shine a beam of light toward the surface ily t*uci)g 5)in order for a person on a distant bank to see it? (The index of refraction for water is 1.33.)

A. $41^{\circ}$

B. $49^{\circ}$

C. $59^{\circ}$

D. $90^{\circ}$

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96#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light, traveling in air,*a lvt ed2h*e, strikes a plate of transparent material at an angle of incidence of2,te**l haevd $56.0^{\circ}$. 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 tr0;cj (kg0qcmuh (clf(ansparent material. kcuh0ljg;(q(m cc0f( The incident beam 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.bqtk9las7 ,-yj9 hqd; Light is passing through it at l;k9ayd-qs7j,h 9bq t $53.0^{\circ}$. 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 criticalyjgtx0: n*+gfsd;*06ckorzce co6 z* angle for light traveling from crown glass (n = 1.52) into wat; j*f6d* c+e:cz r0csgo6n kxgo0 zt*yer (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 itswo*sn0xrs. 7k critical angle of incidenowr07kx . ssn*ce?

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 clea* (v bt(6xknpkr plastic with index of refraction of 1.50. For what angle of incidence will light remai6kbvx nt((p*kn 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 substance is measured atysqg.x5el*/ x $57.3^{\circ}$. 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 fro8hg5fb c* dzovb9 -vr6m 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 diametwb4 aifziu 1* 89so*,d jfco4mer of 20 mm. Its ends are pe4i 4jbwa8 z1 iscufd*o9fm*,orpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make before 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 o;d1thp;s ob;ffmj9j t.f(y: in front of a 20 cm focal length converging lens. How far is the image of this object fr o; fjf9st1;:tm. d(jy;ohbfpom 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 withslce1+5n: .)n-+yz ts3swnlw dm/ra f focal length 4 cm. Where is the image5)at-/e1snm+f szwn+3 nycslw.: lrd?

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 ssh. 9 9 )*s 3z9noei3n.wzpi tsqfll;front of a converging lens, and the image is 4.0 mm behinds9* .z;n teh is p39fwszl).qno3i9sl the lens. What is the focal 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. If the image is 4,q8he .i,lg0e;ho:i e vxm*ll.0 mm tall, how i, *eoemvleihl .8gx0 ;:hl,qfar 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 invertedz ft1a*ymw a11qfjkua:b,:v 1 image is half the size of the object. What is the focal length of this lenba:af *f1w11yjaum1v ,:k zqt s?

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 i axe. +poc8a/yau,x o6ybpk0n xk9.s8n front of a converging lens with focal length 5.0 mm. Where is t,e/on986pcxy+x.k8y.opaas ua x 0bk he 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, a;tl hl 3cgrqu( hira8dyq64, /mfnj68lp6tt0nd 10.3 cm from a converging lens. The image is virtual and 6.2 cm tall. What is the focal length of the lensquc,mih(6t3rlj8 aqd6 l gf4yth6lt;np/ 0r8?

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 fro9vrqa8 1kyi y u:p-z2*lq+sdy m a converging lens. The image is 4.0 mm tall, and 9.0 cm froyi98 yqrza1vp-s*u:kd+q l y 2m the lens. How 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 from a converging lens, it forms a real imague pf9 k,f2 8hph;h iq(57xswie. Wh,u ipqish2hf;k xp 7 (9fw8e5hen the object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What is the focal length of the 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 4a)uc5r xis95sia v7 z mi3y 2o8puy2hthin convex lens. The lens has a focal length of 10 cm. What are the values, respectively, of the image distance and lateral magcr9yps5)2as ioiu i23 m5ahyxvz 47 u8nification?

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 divergi:0 woj x8;fjz+mnv+ yxng lens with a focal length of 10 cm. What is t zmnjy:o;jv8xxf+0 w +he 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 k3khp-s q pnosdam8.p/) r:bcsh;;x:lens with a focal length of 10 cm. What is the magnificath k:s:krn/)pa xo 8-cbpdshpq3;ms. ;ion?

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 divergitp+9g4 5us5zel2wemzp0o6 e sng lens. The image is 4.0 cm from the lens. How tall is the imazp5 5s t 0pgwz94le+2mues6 oege?

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 divepvk vvz3 s9a2/rging lens. The image is 2.5 cm tall, and 7. 3/zk 2avvs9vp5 cm from the lens. What is the focal length of the lens?

A. -6.0 cm

B. -7.5 cm

C. -13 cm

D. -18 cm

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119#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 40 cm from a thin lens. Iffr8q obzhh74uk5 o.3z a virtual image forms h4rbf5 hz q3oku8.7zo at a distance of 50 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 length 50 hksaycg0. :g :mm must the object be placed if it is to form a virtual image magnified in size by a factor of : .gcy hgsa:0kthree?

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 focala /4 *ratzrhc+0 )*mtyjq,ojh length lens, such as is used in many 35-mm cameras, must an object be positioned if it is to form a real image magnified in size by a,h/ rqm+)a zt0yh oj*ac*r4 tj 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 focal length 20 cm, ar*bboo2mu e)c;juicv; .2 / pwje placed in contact. What is the focal length of this compound lens? o2ub/ov* up;ie)mjb ;2jw.cc

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 mdcne4xt1s*vn)h8j 4radii of curvature 46 cm, and is made of glass of index of refraction n = 1.60. What is the focal length)n*d4se n 4mt8j hv1cx?

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 40h4 xcue,b a.i-y ( fejwka-427p-zi rt cm on the front side and 30 ctex-bu.,y-aza 4rc- iph2 i4( fkew7jm on the 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 using a piece of plasti t(f+q(0g.y.iwqwr2 wiqxz/ jd7u s l/c (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 length of the l(w(qwy xdi2/ qz tiu j.l.w0/gf rs7q+ens?

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 focald9 )gex:(lh itxgcto4 -6v ds( length of 40 cm. It is made of glass of index of reft)ox h dxd:4g clt6sge(iv-9(raction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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