Physics Unit23: Light and Geometric Optics

1#

Reflection, refractiwd;ygfyz+v i9tjp321 7ql8 ibon, and the formation of images by mirrors and lenses has been successflwi2 b9ijvty3;8dgfz qyp + 71ul 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 incidenxw8oqd hbe*.xpoq0b 65wzy8x nes 166ce

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 mirrouo,ur ghiir tr+;2v na48.g:prs 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 formsww2* u hgo md6e/b:n0-kzd* re6jo- de an image 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 )jhih+iszcl p/7yj b+5o/3ha 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, 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 t0 x qw-g+ ,tv+,flyio*+fouw.mr nrs0hrough the image location, and would not appear on paper or filmow00ff r +xlv,*uygo mrq +t -.+wis,n placed 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 t r zy7ghjr0r 7 u7rer52-jjq*dhrough the image location, and could appear on -0hy 77*jjzrd7rr j5ueqgr r2paper or film placed at the that location is referred to as

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible to sewt)k 5 nub;36 vj4qouwe a virtual image?

A. No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image.

B. No, since virtual images do not really exist.

C. Yes, the rays that appear to emanate from a virtual image can be focused on the retina just like those from an illuminated object.

D. Yes, since almost everything we see is virtual because most things do not themselves give off light, but only reflect light coming from some other source.

E. Yes, but only indirectly in the sense that if the virtual image is formed on a sheet of photographic film, one could later look at the picture formed.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on whi6y/g6k;cqm :rb vl5uoch reflection takes place on the outer surface of the sphericab5;v lk6/cm6gyo qur:l shape is referred to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on x/ k 5pf0kc vncn,d)6jol3d90mmwwj0which reflection takes place on the inner surface of the sphere i90c f0l /5 odm)nw,kwxnjv kc m63d0pjs 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 is r, the focal length isq2g-mg; s.yavkelp/7+ ;g u dm

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, strikes the mir3 tedxk7j-h*ly 37nau ror's s3*l tu 3-nk xye77ajhdurface 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 gc 807e0 q3y: 8xtifhjvozge /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 tox 8 iytl4p +fea;)to3ye4 fy:q a concave mirror's axis, crosses the axis at the mirror's center of cur48l+qy)y xfi :o3efe ;ap ytt4vature 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 thzxnxl -k+ a.e0xi*u3ge 4qg8w. sp:tdrough the center of curvature is refleetd8exk p *0lui+x gzq.g4a3x-n.w : scted

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 surfaceg njvqw1tuo 8.a dj54)d27 jfn, crosses the axis at the mirror's focal point before striking the mirrorfajgndn7t5w84j j dqo1.v u)2'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 p qs- k5;tdtqgm7fl, jl 1bso65ath through the focal point is reflectebj5l fs6 ;td,go-17q lqm t5skd

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 posp ym c)f4i1b5th9sxa4ition due to a curved mirro s5 )ic4pbtfax4y 9m1hr.

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, exact xi;gsn8fp/o a nmh65n m jjl64o24tm*ly at its focal point,

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

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

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

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

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

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a concave mirror's center og +f7-j7ied- blmjnb y9oll;) f curvature. The image produced 9j ) gmodlfj7l-b-i+7yle;nbby the mirror is located

A. out beyond the center of curvature.

B. at the center of curvature.

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

D. at the focal point.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is positioned between a concave mirror's center of curvaturein n0y r5xk:4 lf*+skaz uz7k* and its focal poin x+s45k:0ya kuk7 znli*z*rf nt. The 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 a concave mirror's surface andtg lomd rht3my., bav1i,1n03q , wiwcdn364k its focal point. The image formed in thkt d,,,r dln ti1q3cn3g ovw1a. 43hmiyb6m0w is 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 p3gm x+ no1n5wkw 4a1f,dump)convex mirror, at the same distance from it as its radius of curvaturepwnmn m41og3 ),apdw+f1u kx5,

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 di-lxn,svd4- kud v;;a ostance from it as its fo;-n4-lv o sx,d;vudak cal length,

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

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

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

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sometimes when you look into a cur g * bnvpf72i d.lxmrp+16hq/73ujkefved 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 wv qm ie7 pf/b6p.gn+ fkx3jr1h7d*l2uill 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 4d2on4e d1gr-l7xy 7w; dwk mbproduce 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 imagej k.r(8ebxuu1s 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 agv1,v5jc c*g gn image which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex spherical mirror produces an imageyon3su c6 dq)x ; abk87d;cu(g 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 u*0mq/i* gmwra 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 posivc;tug09+w5k c0b-qr(lrztm tive, the image formed is

A. a real image.

B. a virtual image.

C. either a real or virtual image.

D. can not be determined.

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is negative, the image formedk y :sq-gxttmqmei:j7i7 )2 (y 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 a1r yq 41i-m 9b6s8btmxowcnj6i35 zgl positive value, the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is a negative va/a9vaaf-q:hm j,a( qg+e 66 3ijpiok llue, the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is larger than one, then thu,*zv ej l35pze image is*p3zuze j,5 lv

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 magnificybimr s30h (fc1m3fc 4ation is smaller than one, then the image ismmf3cfhcs3 r0 (b 14yi

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 is78s ;lm-f2rqdw oqms/n lw9g3 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 fastes .* 2ywxdj+k+a+rdpykt

A. in a vacuum.

B. through water.

C. through glass.

D. through diamond.

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For all transparent material substandi9vqd85 7,xndxtl7j ces, 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 t1j bs3b y(k8xuhan 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 diamond42p/+zi ruv-m;fxv )kov.tif ld5/ uu 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 incidenu(y cn0)pgsc2ce

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 oqh4:zlcg-sle7z1 h /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. T3gj/5mikl .* w m(rmqzhe angle of refraction will be

A. greater than the angle of incidence.

B. equal to the angle of incidence.

C. less than the angle of incidence.

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ray of light, which is traveling in air, is incident on a glass pladvo zu-vm402ute 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 ott4/xo2o;6kh 1gjy y xptics 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 waterjfd15xt9e7c vte )(q j 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 wordxvg5cy vp3o. *om+v b,69yc qk 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 centedz q r3n-nb1ap 52ar+jr 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 are calledn f*dw f7x8q8f

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 coi fxw-rr :;j/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 are0kh3tn9 m5d jx similar except that lens B is rated at 20 diopters, whereas lens A is rated at 10 diopters. The focal length of lh39 0jtn5 kxdmens 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 par5k +wz ,kkhkr*,ja tz)allel to the axis of a thin concave lens, strikes the lens near its midpointkz,5h)ztarkwk*j+ ,k. After traveling 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 k. osajc04bw 0ii e59(js5y4 d-dfwc* tjeb 6oparallel to the axis of a convex thin lens, strikes the lens near its midpoint. Afte bj45wfs40dyos0 .iee* wd6toa9-(kjcbc5 ijr traveling through the lens, this ray emerges traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through its focal point.

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55#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three rays for finding the imagy,u+ ldkn8e 7-oprrf 36 qy7ohe position due to a thin lens.fd8 yk7 n uq7 hpy3ro6,+lroe-

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 len5h3s* 8p1yv xr,ieyalgth $f$. 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 focnvdj+ 00o jdc8al 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 focal lengt9 :zx.1 qwyq az7xy7euh $f$. 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 lenhv rq(:; niu9mgth $f$. 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 focald ni/uf jz49i8 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. The :: efrw/*w fgximage formed isf/* fgwxwre: :

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 concavf)b,;f0/8welfdhx bnhx66p 0p en 5xy e 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 throughgx(:iziqj- k c6u)q ao+ x0xgg,g2 +vc a magnifying glass is

A. always the same orientation as the stamp.

B. always upside-down compared to the stamp.

C. either the same orientation or upside-down, depending on how close the stamp is to the glass.

D. either the same orientation or upside-down, depending on the thickness of the glass used.

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lamp is placed 1 m from a screen. Between the lamp and the screen is placed - slo3-tjpjgw,3(w oba converging lens of focal length 24 cm. The filament of the lamp can be imaged g , p-o-wsj(3wjbt 3olon 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 lengths 3s ,hg4 p2l45fpr4mlivw2vb d$f_1$ 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 (conpv:aw w:f c.7,o2ki cs0c0qgzvex-convex) lenses are placed in contact. If each has a focal length of 20 cm, how would you expect the combination to functocvk:pfiaw gs0c2c,7z w: 0q.ion?

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 anglpkpfg0wq4l (: zziki7g 5ig z4xp) /)je of incidence of g :ji4 qg)4igzkk wpz i7xzl(p)f/05p$52^{\circ}$. 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 plare b.tcym .a2 -r vd+9l4u-hbxne mirror. The image formed by the mirub2d.+4cea -h-b.t9 lrmvr yx ror appears to be

A. 1.3 m in front of the mirror.

B. on the mirror's surface.

C. 1.3 m behind the mirror's surface.

D. 2.6 m behind the mirror's surface.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far are you from your im* 2goe 4i-wg*jv ioz6lage when you stand 0.75 m in front of a vertical planegiev*jo26 lgwi-z* 4o 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 mirror pjf -x+j:fqx t68hpy* atp- +xtjfy 6j *fh:qpx8 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 fromktatdq 5e2q t./j/o0 c the mirror is theq/2tkd0. qcetto5/ ja focal point located?

A. $10 \; cm$

B. $20 \; cm$

C. $30 \; cm$

D. $40 \; cm$

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave mirror with a radius of 20 cm kyh .10l sh qz g.-7ktmz2dohra:hd9-creates a real image 30 cm from the mirror. What is the objesazqhzr hk-:.k0 hl.m71 -dgth9 y2do ct distance?

A. $20 \; cm$

B. $15 \; cm$

C. $7.5 \; cm$

D. $5.0 \; cm$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is 12 cm in front of a concave mirror, and the image is f)59ij 6p zndgude8yvfgkc)- i 6s0 0o3.0 cm in front of the mirror. What is the focal length of the0g i8-0ozp dj6visucy f )5nd9ge6)fk mirror?

A. $15 \; cm$

B. $4.0 \; cm$

C. $2.4 \; cm$

D. $1.3 \; cm$

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10 cm in front of a concave mirror with focaj8 r.c9xt ocv3l length 3 cm. Where is the i.j o3trvx9cc8 mage?

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 c34x89.fglc ho;rpd nis pn5. ); bkszmm. An object is placed 10 cm in front of the mirror on p p4sc3h8s ;9 ko ifngznx.;bl5.)drmthe 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 focaf24nm/q wf-gr(;d tjal length of 20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is-wj m2/q ;4agrn(dfft 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 10olo;m(nwshq bm 0fi9:-4ttr 0/tsq8 k cm from the mirro0(m8 rq-wqomsn:f hs lkt;ib t0/9 o4tr. 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. The objewv2o0a +bf v,2k)ea2(h s7vt ily:tofct is 4.0 cm tall. How tall is tvftw)+y b2e2 tkvisf h 2a,(:v7oo0 alhe image?

A. $1.0 \; cm$

B. $2.0 \; cm$

C. $8.0 \; cm$

D. $16 \; cm$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 47.5 cm tall. The image is 38.6 cm tall, and 14.8 cm fro f.1d1, f7dgv0hk xfpbm the mirror. How far is the objfd0 fh p 11kfxb,7vd.gect from the mirror?

A. $124 \; cm$

B. $47.6 \; cm$

C. $18.2 \; cm$

D. $12.0 \; cm$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.4 cm tall object is 4.0 cm from a concave mirror. If the image :xr- ch,v 961wr- nczw ssf-izis 4.0 cm tall, how far is ifscz -1,v- 6hz c-w: rs9xnwirt 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 lswlbh+p s v/ md8/)wr,8q9 qjsength 20 cm. The object is 4.0 9rl/ dps8/ smqjs8w)hbqw+,v 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 mirr4s*o.hy6 jyrf(avx0r or), the erect image is t f( 04ra6jyoxrv *yh.swice 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 a concave shaving mirror. If the image is bzo bj15) 7zb4 r1t5wf ijudw.an erect image 1.5 times w1t5 bzu5r1)bj 4b.z wjod i7fas 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 behi(pos,9ki k k 6de:,enjnd a concave mirror with focal length 5.0 cm. Where is the o(ikpn ,e 6,jdsk9oek:bject?

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 f(xavg4.r utcu-h) vx1j0m ewh. w/qz-ocal length of -20 cm. An object is placed 10 cm in front of the mirroruhzxqu w(v 0)a4mtvrw gx--hc .ej1/. 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 mirrjg ic.ma)d,g+ or has a focal length of -20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is. gdjgima +c,) 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 i51 bx iwsx--dfyf0i6 bmage is 5.8 cm behind the mirror. Whasb f fi1-yxib6d5-0x wt 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. *(+/1k9qep)6m-g*in yknge yrja mto The image is 7.80 cm tall, and 14.8 cm from a convexete) kgm* jyq*m/(9y k6 npari1+ ngo- mirror. 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 is the speed of light thr ugs9n0g5g+x mgsgm + gxn095uough 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 interfaccl3ho 7+7 lwyce 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 subst:8vfco oob5j3ance 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 ax ao e:om+kw-um l7:4water. 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 wrsf734vucd*aley10: b p5qois spread smoothly and evenly over the surface of water on a windless day. What is the angle of refraction 3lr4cwd5aye fq0 *:u1 vs7pobin 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 r7bk -sh/dqv uypotz9e 1 w i/*)qkg0/surface of a still pond of water. At what angle must/ dkz/h*0qk is)1o g rp-e7wqy/u b9tv 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 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, strik +-tcsj5z b8hvl2x 2bges a plate of transparent material at an angle o 2 2h8+sbjt5zv blcgx-f incidence of $56.0^{\circ}$. It is observed that the reflected and refracted beams form an angle of $90.0^{\circ}$. What is the index of refraction of this material?

A. 1.40

B. 1.43

C. 1.44

D. 1.48

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97#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light traveling in air is z*jgpvs6(z+ pd s 82oeincident on a slab of transparent material. The incident be6zjov(8sep p2 +g s*dzam and the refracted beam make angles of $40^{\circ}$ and $26^{\circ}$ to the normal. What is the speed of light in the transparent material?

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

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

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

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

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98#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A substance has an index of refraction of 1.46. Light is passing through it:*(0oir p ipbtwyj-:a at jiiwpt*-:(a 0ro:bp y$53.0^{\circ}$. At what angle will it leave into the air?

A. It will not leave.

B. $59.1^{\circ}$

C. $43.2^{\circ}$

D. $33.2^{\circ}$

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99#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the critical angle for light traveling from cx:,1v85/6 o85hvh;symjw yf rb gu rvbrown glass (n = 1.52) into watej85h 6r5wx1,s fvog v; yvbb/y8m:ruhr (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.+/ mn,q.qj. arblct (bbht) 97b xkvvev10z h+ What is its critical angle of incidence?q1 v mhvv0zcaq , enx+ tr7b)+b( kb9thj/b..l

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. F3 (z lr)r.gl. ,k6+xntx9rprc alwur7or what angle of incidence will light remak,l.lrcxzu7( +)na6twrpr9 r.l gr3 xin 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 measure3(sxwb8ik +g3w7tyd ;/zm b zvd 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 substang(cppj.)c;6ups m or1ce from air at $30.0^{\circ}$ to the normal. It continues through the substance at $23.0^{\circ}$ to the normal. What would be the critical angle for this substance?

A. $53.0^{\circ}$

B. $51.4^{\circ}$

C. $36.7^{\circ}$

D. $12.6^{\circ}$

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104#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optical fiber is 1.0 h vpa6*n v(/j kw90th9zxngh/wkez (2qw5s7x meter long and has a diameter of 20 mm. Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make before it emerge9xpg7kw(hwjtswz /0 h/ 9zvh5ae(k *nqn 6 2xvs 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 lengtv of 5m;bfp2k,tgu/pkh z*8,sh converging lens. How far is the image of this object fro/, vzogfp5msbft*uhk,8 2 ;pkm 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 g5g*4e u*vk snlens with focal length 4 cm. Where is the ieu5*k4 nvsg *gmage?

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, 5:l;fs 9p udqd- neq9nsw + ltce92amh6vr6m(and the image is 4.0 mm behind the lens. What isq rsl9am- p(+u 5v6fe :sh ;26wtdlqncde mn99 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 nuvkuq :z g3 czc;:k fc)l)q/rrv,k.9 mm from a converging lens. If the image is 4.0 mm tall, how far is i/r n);q k:c3q.z:rlv ug),kfu9 vckz ct 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 frq dv/eu)69 wynont of a converging lens the inverted image is half the size of the object. What is the focal length of / 9quwy)vdne6this lens?

A. $13 \; cm$

B. $20 \; cm$

C. $40 \; cm$

D. $53 \; cm$

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110#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 mm in front of a converging lens with focal length 5.0 mm. 3h.nlmowbzl;q5 4o41 me drx 1 Where is the object. z1xbohedm 3o 5m lqnr41;4lw?

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 s alge,i6/md*tall, and 10.3 cm from a converging lens. The image is virtual and 6.2 cm tall. What is*a lim,g e6sd/ 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 (hp t8ps.mtl5ens. The image is 4.0 mm tall, and 9.0 cm p .(t 5thspl8mfrom 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 convergingo-58-dpgmv r y lens, it forms a real image. When the object is moved to 40 cm from the lens, the image moves 10 cm -o-r8y5p gdv mfarther 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 thin convex lens. The ldtm55 s-qh6 cf1 k1zv6 xb2uhr8+jfeb ens has a focal length of 10 cm. What are the values, respectively, of the image distance and mr j5q8z1hh-d b+56ufe xt1c6v2bfkslateral 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 focal length2ng+ni y(t8v g of 10 cm. What is the image d+gvn28ty( gni istance?

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 kdl jh3b40(1nigib: 1c1dt8 obn/ yrz cm in front of a diverging lens with a focal length of 10 cm. What is the magd18(bc d kn3t4i by/ogjnir h :11zl0bnification?

A. 0.25

B. -0.25

C. 0.67

D. -0.67

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117#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10.4 cm tall, and 4.8 cm in front of a diverging -wjh04j r nc7ilens. The image is 4.0 cm f-ch4wj0 ri7njrom the lens. How tall is the image?

A. $13 \; cm$

B. $8.7 \; cm$

C. $5.4 \; cm$

D. $1.8 \; cm$

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118#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 6.0 cm tall, and is in front of a diverging lens.tu8g9/p/ *uzcfrlk(wtw c ,nk16zf: o The image is 2.5 cm tall, and 7.5 cm from the lens. What is the focal length o/zz 9u c6cpt:ft 1o,krww(/ *8nlfkguf 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. If , jmua *)a9a58dsgq clabh1n)a virtual image forms at a distance of 50 cm from the lens, on j)u 5c 9,aq*a ma)lag b18nsdhthe 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 o c59tc3 aoru;hbject be placed if it is to form a virtual imao;5c9r hct ua3ge magnified 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 zb-5k zlan9f( in many 35-mm cameras, must an object be positioned if it is to form a real image magnified in size by a factornka5 -fz(9blz 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 plaxfiik:4e7g z,ced in contact. What is the focal length of4kf gz:7i,e xi 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 (convex-convex) thin lens has radig1ih8+ m 12s bc+*mfla4wyhtm i of curvature 46 cm, and is made of glass of index of refractim m m1thcyg w8fb*+a+4l2hi1 son 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) dhp,fp-:.5mk zdp9b c has a radius of 40 cm on the front side and 30 cm on the back side. What is the focal length of : p,9f d bp.-kcpmd5zhthe 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 p4ri)iin/ 6:5 ( fyiwwm, hbaoyiece of plastic (n = 1.70). The radius of the front surface is 20 cm and the radius of the back surface is 36y4 m ibi fr5w (an,yo)hi:w/i0 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 isredp l k+tl 8i:p(*p5qhos *+d to have a focal length of 40 cm. It is made of glass of index o8p5r i(+lp qsdoe:d *khp+lt *f refraction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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