Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images by mr+*q pqj t:ec + 25lgkp/.pdxmirrors and lenses has been successful descr+2l5dpq.g/rc +px:pkq* e mtjibed 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 incidencj u. (k*qce6d6c.fsvie

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 mir*so 7th5e.rty rors 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 is8 45ha-arwkeeut qz ;:

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 wqg6gpa1; :fgf hich

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

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

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays do not actually pass througgm b3jqae. :0s fn7vd.h the image location, and would not appear on paper or film placed at that location is refer:d 3g.e0abjmf vns.7qred 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, an8 q; x: a .f,o8,qpffgb gzcsybk ;lhkud//0:vd could appear on paper or film placed at the that location is 0cbxfk f.d;8okq:ug//gy8zlq: , a;vs,phf b 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 vitf)+f/n4 w)kly6gj cprtual 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 refl*ocudlm)*w2 c*leoxkxm: w 91 ection takes place on the outer surface of the spherical shape is referred toxckw**uo2x : *ldo 9cw)e1mml 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 othqro-64v5zt y b 20k56dth +yd(zmkreflection takes place on the inner surface of the sphere is rez 5t dov06- mhtqt+5zy(hd 4ko2kb6yrferred 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 of1 5pu sn 5svjkxk9v fx.l396ee 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 par yla/ln.3p8ij allel to a concave mirror's axis, strikes the mirror's surf8pn lija3y /.lace 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 path parallel to th6ii jx ;;5rdfm1;gn p4ce( m qtrr0p4we 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 the axi gn 52nh20lgz/e6yhk cs at the mirror's center of g0n 5/z y2g6nhhk2celcurvature 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 path through the center of curvature v . b2t6 rugn)vqyra:qip(+i:is reflec6+tpv.qain) (:vq2ir : r byugted

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 awi 0c/;rx*uh 5b1tfp dhe-q*l concave mirror's surface, crosses the axis at the mirror's focal point5tqehfrb; cw/ x pu*0di1l-h * 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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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a co+/ut)sm; p * zyh8e/csc;ezal ncave mirror on a path through the focal point is reflecte +pcz/;hml/ay e8seusc)* ;tzd

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 curved /pxrj 49gc r1axwl+qa1g 9v,p 99 lrcxw, gvpa r+41qx1p/ga jmirror.

该题自我估分: (必填) (满分:1.0分)

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a concave mirror, exactly at its focalp64e wcy:*lno 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 at0v rp5yas13nxhxm0m 2 a concave mirror's center of curvature. The image produced by thv5xmm x0p12rsy 0a h3ne mirror is located

A. out beyond the center of curvature.

B. at the center of curvature.

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

D. at the focal point.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is positioned between a concave mirror(ic .q yg2izd 3:zaus,'s center of curvature and its focal point. The image produceduz,z(si.q23 idya: cg by the mirror is located

A. out past the center of curvature.

B. at the center of curvature.

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

D. at the focal point.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is situated between a concave mirror's surface and its focal point rr,s+us,ay4p:a)pyf. The image formed iny y fss+,4app rr),a:u 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 mirror, at the same distanc15ixd fu ;ane4:yt.a ne from it as its radius of curn:nea tix f1du4.a;y 5vature,

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 distance from it as its f2 jmi dbz3n43kt:b q ua30:eqnocal 0b b :n332q:amzd kij3tu4en qlength,

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

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

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

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sometimes when you look into a curved mirror you see a magnifie*d f-/ 6lkru qxdawb3o3 i6y1ld image (a great big you) and sometimes you see a diminishe xi-l66/uwq lad3ky31dbro* fd 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 mip;,s)x lzpd (brb;m7drrors 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 produce11k l11kxc1,nky hocu images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

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

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single concave spherical mirror produces an image whiu0t8:7r*o. l wmmam2jv:yb aech 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 im4c()**nxjlrfyzcnm am+ *nlcy i(,*aage 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 forjz8rmjrh-(3/p i)yli 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 im+*fe ayr owlcr. y; *jo- .x2 6k0yr)s1hkhrcnage 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 negatie4q7 3 sbm/u6hpfsz.sve, the image 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, ther yb 0 6*)iyf/pf:5sgdr;c xiy 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 negata6 pf(3+l3 jhunq.jdfive 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 oxg ;9-el2y lydf the magnification is larger than one, then the image isdx29ye -ygll;

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 vgu+e )uio7 zc0;0)8boffl qt dcz1( uthe magnification is smaller than one, then the image ic (+z;)uf0fbu o 1gtqo08lz)vced7iu 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 magnificati4 hah.2f +exjd3 svr+,l (nvfkon 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 fastestb; i/g:xlu+fh

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 mat7 fi5 pkf5 okyy*des85erial 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 rqah5t72ekr/;k -v 8jrw of6 iless 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 diamev3+8m7) n tma yb)yanond 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 incidencscoa9ysst7 9 je, v5a,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 agbnvt/7u1s i(r9ox/ cn angle into a denser medium is refracted

A. toward the normal.

B. away from the normal.

C. parallel to the normal.

D. equally.

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters air from water. The angle of refr nn eiwl*7bg67action 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 -bng1bmst y ixlu4d 18c/a3t/is traveling in air, is incident on a glass plate at a $45^{\circ}$ angle. The angle of refraction in the glass

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which fiber optizdrks.9gbt q(p:.:h;im*i jekx ;ud: 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 a beam of light passing from water into air z8ag1v kzb /tw0 /g5bqis $48.8^{\circ}$. 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 workd s*6n4 k+zhog1n )sax 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 atpjh7 ;2te jxdo)zta(vni 26,v 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 ed3ur8il t6x+8 k/q whgav5c1 ljdsa(v (ges 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 ax;)t1g8c4i ,cqkofc90 ohiy it the center

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 lensesvy pj4y3mp jjlxrlq4/; w1i6/ are similar except that lens B is rated at 20 diopters, whereas lens A is r6r1yjp ij vjy;l 4w3lmq px/4/ated 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 axis of a o6 7/ x-f;puaq w4krcythin concave lens, strikes the lens near its midpoint. After traveling though the lens, this ray emerges traveling obliquely to the axis ofr;a p6x/w7q of-ck4yu 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 cogga0 zqe h 4rd(/ba*+gnvex thin lens, strikes the lens near its midpoint. After traveling throuhdg*/0qa4r (g+gzab egh 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 rah 3l+o spba-) hbfh1p*rioj)qffa)/ 6ys for finding the image position due to a thin lens.o/fa1q bhf)j -)3)*ihph+rl pf6osb a

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 lemjfd,;xay mb* y+56a :jwyu. xngth $f$. 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 lq ji (7r1da 670g rjo5ecj*edlength $f$. 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 focal9 7a v xmxcu;f43n mu/(ngu(om 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 focaljv e o4:*3pfkwc.fyss+ hud19 length $f$. 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 focs6dgn whnl lc51+s3e8al length $f$. An object is placed between infinity and $2f$ from the lens on its axis. The image formed is located

A. at $2f$.

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

C. at $f$.

D. between the lens and $f$.

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is placed between a convex lens and its focal point. Tkn6gqyzvgf4 q6.a)*k he image formed kgq46kzfq*agv y).n6is

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 concavb1 peen6w a,kkm4n+4oe 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 you see through a magnifying glass) scdseo an+(x00 /ave 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 it7v)iw 2w4/v l3sb4 02kzhjs h8gmcwr( u5aub s placed a converging lens of focal length 24 cm. The filament of the lamp can be imaged on the screen. As t2l5zswv8 3/g) w suu( h7kw4b4matjr0h i2cvbhe 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 0 q;z98u(mwl hb z/3d1bhq puqyvq23pfocal lengths $f_1$ and $f_2$ placed in contact with each other are equivalent to a single lens of focal length of

A. $f_1 + f_2$.

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

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

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

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin double-convex (convex-convex) l68.3u,qdrjjqcevv-;u: :v cgbw c1 ,x dxzgv, enses are placed in contact. If each has a focal length o ebr gx1,vq;: xvwguvcdcc8 jj:.z-q3u6dv ,,f 20 cm, how 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 reflecting surface with an angle of incidenkak hr9k-b-q;y 6dc7 nce of -hd yk-6n9cbk r ka;q7$52^{\circ}$. 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 foryq 2.r8urdd/ xmed by the m82 xrru/ddy q.irror appears to be

A. 1.3 m in front of the mirror.

B. on the mirror's surface.

C. 1.3 m behind the mirror's surface.

D. 2.6 m behind the mirror's surface.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far are you from your image when you stand 0.75l bu gv7 e:,j6tiy0+3i0foask m in front of a vertical planefijogebv t6i+u3 :,kyl07 a0s 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 approach your image when you approach a vertical plane mirrorofl:m2ir,pg /ybz7 g5c:z9 s3pu/b9 sqno.qo at a spee nyf/lc2 sors.m9 go7qg,9u/::3pqobzz 5bi pd 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 mirrorvf ehukq8s/)u8t60sblz3yd 7 has a radius of curvature of 20 cm. How far from the mirror is the focal point 6yq 88st/he)flbu zukd37vs 0located?

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 radi50oi u+9jqznpus of 20 cm creates a real image 30 cm from the mirror. puo0 5 qn9i+jzWhat is the object distance?

A. $20 \; cm$

B. $15 \; cm$

C. $7.5 \; cm$

D. $5.0 \; cm$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is 12 cm in frontip2p5 8vs9 /s e(pfbon.pw 3qk of a concave mirror, and the image is 3.0 cm in front of the mirror.npepi bw f5 s32ko9p qp8v(s/. 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 con2z3k-l*o spbku0 i5ad 97ip1v8l w waycave mirror with focal length 3 cm. Where is th z193 vk*05 ki82oay7 pap lwdsbuwl-ie 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 mid hvbd5+y 0c ht7p nj 2hyug9fl+98q:qrror has a focal length of 20 cm. An object is placed 10 cm in front of the mirror on the mirror'8jyqdg97hb c 0++uhp nd q2t vy9l:5fhs 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 object is placwxllfg 3 1 xjogn)k80.o +3i;bp rzw5ied 30 cm in front ofg5+. ;zlxxol3gp0iji 3)k rwo wf1 n8b 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 fro ahq 7hsw8w9d;m a concave mirror. The image is 4.7 cm tall, and 10 cm from the mirror. How tall is t q7a8d;whwhs9 he 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 concavtw ;zucom 0ljb2f ud+ jp6204we mirror of focal length 20 cm. The object is 4.0 cm tall. How tall is the image?ofju6;l du0tww42m2 jpz0 bc+

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 he -m:gl8m ww/,yod1m tall, and 14.8 cm from the mirror. How far is t wyeomd,-m8l/mh w: 1ghe 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 sc g +y5vu9w0,g52 489yzglkhfeisic from a concave mirror. If the image is 4.0 cm tall, iu2vkg c8yew 5hz+y 9ic045l fsgs9g, how far is it from the mirror?

A. $11 \; cm$

B. $9.4 \; cm$

C. $1.4 \; cm$

D. $0.090 \; cm$

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirror of focal 7jqjwwk- g2t.zxz k9(length 20 cm. The object it9 w7-kjzgxkjz (2 q.ws 4.0 cm tall. Where is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 40 cm in front of a cosmetic mirror (concave uv2eto) z-buo 0m)ae. .azrg (mirror), the erect image is twice the size of the object. What is the focal length of the )o)voz-uu be2mg.(.z0 e artamirror?

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 the i7sa n 0j1t/x+8zzlwaqmage is an erect image 1.5 times as large as the object, what 1wtzax l /s+a zqj8n07is the mirror's focal length?

A. $20 \; cm$

B. $50 \; cm$

C. $70 \; cm$

D. $90 \; cm$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 cm behind a concave mirror with focal length 5.0 +1ecr )znr:zyr6qgec; ux2h 1qyd 7s8 cm. Where is the objd)12rsy qz ;yr8r +eq 76uhn: czec1xgect?

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 mir ai;apc cg3y(tjn5hn pqbi-p// 0b( 6cror has a focal length of -20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is (0(b n3/apjp5ch6p;ncgqcy ia/ t ib-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. An objz3u r r(gww.d:tx2.lz ect is placed 30 cm in front of the mirror on the mirror's axis.gx w3 .:zt(w.url 2zdr Where is the image located?

A. 12 cm in front of the mirror

B. 60 cm behind the mirror

C. 60 cm in front of the mirror

D. none of the given answers

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 14 cm in front of a convex mirror. The image ouzhhk93 3a 22w *knyris 5.8 cm behind the mirror. What is the focal length w2a3 nyo 2z*hr93kku hof the mirror?

A. -4.1 cm

B. -8.2 cm

C. -9.9 cm

D. -20 cm

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 8.90 cm tall. The image is 7.80 cm talgvunq)xl-* ,y13b lszl, and 14.8 cm from a convex mirror. What is the mirr,bl*g-y u z1 3)lsvxnqor'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 the speed of lmb9l4,zz6xdpcz a l*z/:jp6aight through/ m49l d6b: 6paazzx ,pc*zzjl 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 8wjzi4e c)urnaf+ k yup:7i5)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 a :j: 5euj d*uchanzs-0s,k 7vyn 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 m qvt./ib * 8a68yd6y91irbwnaw;bu3 gj0 vjdto water. The incoming ray is at an angle of $17.0^{\circ}$ to the normal. The index of refraction is 1.33. What is the angle in the water?

A. $22.9^{\circ}$

B. $22.6^{\circ}$

C. $18.3^{\circ}$

D. $12.7^{\circ}$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An oil layer that is 5.0 cm thick is spread smoothly and even:obtl/)0i 96 cjs:svo5psmon ly over the surface of water on a windless dti v l)co::s ob om0s5/9pn6sjay. What is the angle of refraction in the water for a ray of light that has an angle of incidence of $45^{\circ}$ as it enters the oil from the air above? (The index of refraction for oil is 1.15, and for water it is 1.33.)

A. $27^{\circ}$

B. $32^{\circ}$

C. $36^{\circ}$

D. $39^{\circ}$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diver is 1.2 m beneath the surface of a still pond oc hwkjdv)bsi2b od)wm oeq-iw )83)5:)nn s (lf 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 wl))2)ddih-)(o:5i je bw qosvnn mkcbs)w3 8is 1.33.)

A. $41^{\circ}$

B. $49^{\circ}$

C. $59^{\circ}$

D. $90^{\circ}$

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96#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light, traveling in air, strikes a plate of transparent material at a os 5dmj+kfq8*w1kg: vweqy-aog9x/7n angle of incid+fx1jyo/k dvakwo-qgq m7s:5*9g 8 weence 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 sla3istp3btvq3*b : g)rl3o/ ftp z4kx w:b of transparent material. The incident b :ptbxotk p)grq b4*3fl33:w3/ sivt zeam and the refracted beam make angles of $40^{\circ}$ and $26^{\circ}$ to the normal. What is the speed of light in the transparent material?

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

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

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

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

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98#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A substance has an index of refraction of 1.46. Light is passdxz,ejo6g opp0)x jw0pre: h m o+u9:;ing through it at jp o) ;r:6d,pp9wo x0+u:meeh0x jgoz$53.0^{\circ}$. 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 ans w0q/zr0kx5vq*r 6 gngle for light traveling from crown glass (n = 1.52) into wateqg z/vwnsk0r rx60q*5r (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 oiwj)h.f2;u7 s f poo,ef refraction of 1.50. What is its critical angle of incidenceos) 7 ,hjp.oufe; i2wf?

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 plt 0--4k 4j pw4watczddastic with index of refraction of 1.50. For what angle of incidence will light remain within the p4dk40 cw-t-zja4tw dplastic "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 meawg)q;+c gw8ccfph mu q62 f1ac r/v*2csured at $57.3^{\circ}$. Light enters from air at $45.0^{\circ}$. At what angle will it continue?

A. $34.7^{\circ}$

B. $45.0^{\circ}$

C. $53.7^{\circ}$

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

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103#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance from air at3v(u wuloh.yeag +o, , $30.0^{\circ}$ 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 mm. Its ends (g*uhpp9/ twt are perpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of9*t(p gu/h twp 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 focal length converging lens. - kjs 1uddb:/b How far is the image of this obsdk/bj:- 1budject 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 fronv /5cm: 30:zop oarizpt of a converging lens with focal length 4 cm. Where is thez0v/p 3a oo zpr:5mic: 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 is 4.0 mfi:(* tbx3e ,ixczk40fn6 xvbm behind the lens. What is the focv e(t3 64kxc fi,xb*:bfxn0z ial 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. t :jv*vwbdx-9-o vt8xi l106ng.h gafIf the image is 4.0 mm tall*ghjtfv 0i - 6x9 .-81vdoa gn:bvwxlt, 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 l rpv9.o/xmbdt:33i+k p,f y o/lin/udens the inverted image is half the size ofd9bo3pp +/lt/ ix/r n. umdky:3oiv, f 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 lenbfv7;na- pnynk )6ib7)l 1ytfs with focal length 5.0 mm. Where is np bitfnl-kvy6) ya 7b;f1n7) 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, andze ty6 ef7ru8-0hv e/z eb qrc6;)g8wd 10.3 cm from a converging lens. The image is virtual and 6.2 cm tall. What e c e86g6-yzzqw0h);be tvrrue7/f8d 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 l.cwz*g6 e u:z qsvao+.ens. The image is 4.0 mm tall, and 9.0 cm from the lens. How tall is gazv+uzocq s . e:w.6*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 imagz)l u0 e b4)/mht6tejee. When the object is moved to 40 hbje0)4ezl t tu)em6 /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 distan8ac lc/;7kke0rmlic,z b2*v sce of 30 cm from a thin convex lens. The lens has a focal2erccl, l/b;z *s iac0k8m7k v length of 10 cm. What are the values, respectively, 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 a diverging lens with a fo )jo0llhzo6g(sqz (q* cal length of 10 cmq s*0(oh )(lzqjl6og z. What is the image distance?

A. $7.5 \; cm$

B. $-7.5 \; cm$

C. $15 \; cm$

D. $-15 \; cm$

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116#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in frot:8aw9cl2+-cyju lo p0sy 3bc.p9s vjnt of a diverging lens with a focal length of 10 cm. What is 99bwt c- c +culjva8j2syp3 .s0yp:lothe magnification?

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 37rmcsdl*b :d5 iwp8 tof a diverging lens. The image is 4.0 cm from the lens. How tall is the image?m8dc 5lpt*rwb s 3d7:i

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, o/4 ewu)ucog:7z2svn and is in front of a diverging lens. The image is 2.5 cm tall, and 7.5 cm freunz u)v o/2:o4wgsc 7om 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 th,wbff* 9gd omi3,1lh gin lens. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the object, what is the focal length of 1,l,giff*mb go9dh 3 wthe 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 rdvq139nte3zwj s((v of focal length 50 mm must the object be placed if it is to form a virtual image magnified in size by an3 s93j((zv vrqdtw e1 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 usedr (- b-hn 9,tim*r;h(ro7r shf der6bg in many 35-mm cameras, must an object be positioned if it is to form a real image magnified in *g-7obh;b9 f , hdr(i6r(s -rhnrmrtesize by a factor of three?

A. $46 \; mm$

B. $52 \; mm$

C. $58 \; mm$

D. $67 \; mm$

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122#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two very thin lenses, each with focal length 20 cm, are placed g *) uwy+lye g2lg(kqkg23 malh,:x(f in contact. What is the focal length of thiyw 3l l2gfemh)gga(2kl:u g*kq yx+ (,s compound lens?

A. $40 \; cm$

B. $20 \; cm$

C. $15 \; cm$

D. $10 \; cm$

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123#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex (convex-convex) thin lens has radob,k +rq/uke8yb7l * abb/;xqii of curvature 46 cm, and is made of glass of index of refraction n = 1./ub8 *la bx +yq/k7kroe,qb;b 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:2xs- w dvc tn kp4n4d3o)kuo1 = 1.50) has a radius of 40 cm on the front side and 30 cm on the back side. What is the focal length of theu)2twn1ks4d cv- 4o :x3do pkn lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by using a piece of plastic (n = 1.70). q6u0h k9bkpi.ch8u s 5The radius of the front surface is 20 cm and the radiuhs6hb8c.9 u iqp50ukk s of the back surface is 30 cm. What is the focal length of the lens?

A. $17 \; cm$

B. $86 \; cm$

C. $-86 \; cm$

D. $-17 \; cm$

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126#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plano-convex lens is to haveez bgti:: c(7i* sza5c a focal length of 40 cm. It is made of glass of index of refre: (it i*:5zc7 gasbzcaction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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