Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images by mirrors and lenses lok 8t.i:j(b i7 bqjw/d(y0c g;rwoz ;has been successful des(wid;owgq.i c/jyzt;8( obl7bkj: r 0cribed 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 incidencequgfelv30zfc d 0.55* - xjugb

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 mirz1wdv*z5a 1f3 2 mcqw;othxj7 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 5w6uz;zl tbj;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 images wh jamlzf4 ) .hgbh70() r(c+w gguaaw: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 do0int( o-+y66t sml;nd-xnj ad not actually pass through the image location, and would not appear on paper or film placed at that loci60nonn x(d6 ; s-+tma-jy dtlation 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 9 wz4 w7 syur /zr 20qqjk-db;mo*1iwfpass through the image location, and could appear on paper or film placed at;r s by749 wiwdk-mruqqwf01z2jzo* / 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 see a virtual image6,+ giww9,eh1w k ixfb)c akx9?

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

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the outerqjzdl6ba6me/d n -3l3 4uhtd3 surface of the spheri-/znt qd3jd 6alduml633 4hebcal 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 which reflection takes place o/09msj lp xa4cn2d87edd50*uka rx xd n the inner surface of the sphere is ka5r/7* ad2ddm9 dx c0ps 8n40luejxxreferred 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 curv )bb6 19)pf/ kz7ewbiwjvz(yzature 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 mirror's axis, strikes the mi6ay :77p mvrq;lrvjkd-u+nn/ rror's surface near its midpoint. Afteau+-7;:rnpy7q nkdm lv6r/ jv r 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 the axi*z/ 3vn4d +e9m zc3du-fkbifms 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, crotram rj1:/ck)/esf:srnjk ;( sses the axis at the mirror's center of curvature rae:)jt;kjr(/ kssmn/ 1fc:rbefore 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 thruyejc20d)1g:mxs. v6ekz6v s ough the center of curvature is reflec1)e0v2 :dsck.u 6m6x ezsvyjgted

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 conca6 ( 9:c*c jmtijh;nv9rq; rrmsve mirror's surface, crosses the axis at the mirror's focal point before striking the mirror's surface* ;cc6qmn:;9 jirmst(rr9 hjv. 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 path through the focal pk kbi btjl4o;/cpk:x.)7 f ,6t0vbwymoint is reflectekt : 6w7b.mxb,c;k o0 fjblpvk )4yt/id

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 lo b0/-e8 spty;q,clefinding the image position due to a curved e;lcybo 8e 0l-s/ pqt,mirror.

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, e3xeaf w r*m/a*iz 3h5rxactly 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 mirbw z2ev,kgo .n+.wwl:jpvp:7 ror's center of curvature. The image produced by the mirror invz+7ww,v: : owk.bj.2pgleps 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 positio 7vrj8/rn5c5xo2 tmp bned between a concave mirror's center of curvature and its focal point. The image produced by the mirror isx5t5 r/n8mb 7cj2vorp 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 mirr( :ksv2qko+m vor's surface and its focal point. The image formed in this c:sv m2kvok(q +ase 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 convofu7zkxq 8igo/o570b ex mirror, at the same distance from it as its radius of cuq/7i fzou0g7ox kbo85rvature,

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 ox 1oe:k+dku x:f a convex mirror, at the same distance from it as its focal length, kuexk1:o+:xd

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 inna-cqr*j q)9 vf5htm,to a curved mirror you see a magnified image (a great big you) and som q-vn9,qa tr5f)jhm*c etimes you see a diminished 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 mirrors produce ibtwt +sl)dp h(:5.g g3 ;a*hb hvd) xwi,eg8fimages 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 mirrlk ;d1p40j a r)mb +1evl:egf8dq+ntgors 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 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 mn68kc4l e,acn irror produces an image which is

A. always virtual.

B. always real.

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

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

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex spherical mirror produces an image which 4 q8,rzwvq+ qfis

A. always virtual.

B. always real.

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

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

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnification for a mirror dpd6tumnv;acj*fgf5ql ixh4 np)f ,+ pk/)*; 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, :z dqh,2v)jb f99 k-3iehxbeb 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 distanchcp0p)lf/ /e b2 ,ohuqe is negative, 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,u.oz ld:6.02gd qx *v 5:xad*jzhzfxe 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 /jc - wxsh1o.nubcmf( hbz: +7negative value, the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the g +uj8odkog3dy(ypx y5w5( -7uemd+u magnification is larger than one, then the image iswju5eokx8 m g-dy(yuu+ gp5do37 y( d+

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification isp4f by rhtz(jy ;n1,g8 smaller than one, then the image i(;,rh f t y48jnyg1pbzs

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 tt90fv*+m:dtycw*;vt gj-e,qgnkp + ehe magnification 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 fastesu(f)oei1 skqp:mq,0 y t

A. in a vacuum.

B. through water.

C. through glass.

D. through diamond.

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For all transparent material substances, the index o0 * mjuyq *xca58g8uhdf refraction

A. is less than 1.

B. is greater than 1.

C. is equal to 1.

D. could be any of the given answers as it all depends on optical density.

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An index of refraction less than one for a medium would implyz4zuk7-vn+l ,4p qvo a

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 diamond isa5gtu2ra c .j25f b/zb $2.42$. 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 incidence lt(qmew/56q/wb rxc iy:s ;(n

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 denser medium /4i9q,n io.ce- rmp nhis 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 5k un95ufe4pfc4(h8 zld(ahdwater. The 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, ij4oa ku p,ta583 s ld)ug4dsr4bnz2h /s 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 whihjd ;fu -am8z8c49+gh iz ftf*ch 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 1-pyvd p7.bl+a-t lbfa beam of light passing from water into air is $48.8^{\circ}$. This means that all light rays with an angle of incidence greater than this angle will be

A. absorbed.

B. totally reflected.

C. partially reflected and partially transmitted.

D. totally transmitted.

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which lensez l su 9;jym)1huj)d2ps work is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thickest as75i n -p0bysrl n(yc3t 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(3,ryhx tmbol-9k6w u center than the edges are called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thicker at the cente ,if gqq fyv6/:h 7;wg-nq0pear

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 em7b8m wtobx-w5x5 zma8 s9ki3 xcept that lens B is rated at 20 diopters, whereas lens A is rated at8txkm3wozxm-5wa bs 9mib587 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 thin concave lens, strike8io 5 klu,zxkf-1s:jhd) 3 hxks the lens near its midpoint. After traveling though the lens, this ray emerges traveling o-58:i jfl3,s xh oh )x1kkduzkbliquely 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 lnm)39 c(j y4nclyo*ng2fr3q thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emerges traveling obliquely to the axis of thr(foq39c m2yyjnln)n c*4 3gl e 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 tyg/ .e2 gba;k1clf w/chree rays for finding the image position due to a thin lensb 2 1lk/gw; gc.fecya/.

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 lengt099bfg hcie:+3n b qnvh $f$. 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 fo yreuq).z; ,lb3b 0cbqcal 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 lengthvkn1y 6 bpt6ibqa(d4ro 92x*le1g/ li $f$. 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 leng yfs0 (ffi 3ot(dwwi+ bk-xqe75/iql.8mbtn5th $f$. 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 fo(yao r+v9g )9k pb2gejcal 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 itsy;k*kr1 i1emceu9 k7n focal point. The image formed i 7rny*;m1cukk9i1ke e s

A. virtual and erect.

B. virtual and inverted.

C. real and erect.

D. real and inverted.

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The images formed by concave lensesq:pkt 3q3gp gs ,. y8d 0j6o xv0zwm6i,kadjw3

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 touc4 snh u0v60hrough 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 screec0ca b6ujg82u)e:sgx n is placed a converging lens of focal lejaue6 )280b scu:gc gxngth 24 cm. The filament of the lamp can be imaged on the screen. As the lens position is varied with respect to the lamp,

A. no sharp image will be seen for any lens position.

B. a sharp image will be seen when the lens is halfway between the lamp and the screen.

C. a sharp image will be seen when the lens is 40 cm from the lamp.

D. a sharp image will be seen when the lens is 60 cm from the lamp.

E. a sharp image will be seen when the lens is either 40 cm from the lamp or 60 cm from the lamp, but not otherwise.

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin lenses, of focat:ceod7-(h ckql(zt b8a 1/e:uzt .uq l 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) lenses are oojkdl6:x ; l6)cd.vd+ex -qv placed in contact. If each has a focal length of 20 cm, how would you expect the)kd6.lo-vqxc6:o xdj d; +vel 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:pgv bpvz4d-;7ijnxn5w3 / fc angle of incidence of :5 3gpx;7z4pjvn- i vfn/cwd b$52^{\circ}$. What is the angle between the incident ray and the reflected ray?

A. $52^{\circ}$

B. $105^{\circ}$

C. $45^{\circ}$

D. $90^{\circ}$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is located 2.6 m in front of a plane mirror. The image formed by tb 62f1r )sxfoshe mirror appears b1ossfrx 62f) 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 imageoo1,exlt/8o) achk +q when you stand 0.75 m in front of a vertical plane mirq1xoa k)8,+/tceo lho ror?

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 approa)g(h px,la 2 :;v8 uvn3vj*ed+h(tpjgogx.a bch your image when you approach a vertical plane mirror at a,ggp ;)a( dabh+po n3:gv euth8(vv l2xx*.jj 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 mirrore n4mhs*gy wx( /6;ask/cv :;kjzyy)t has a radius of curvature of 20 cm. How far from the mirrorn/kyz 6 yc ;);jhtvwey/skgaxms* 4 (: is the 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 creates a real image 4,x1ju8hzph m 30 cm from the mirror.jx1hz,4h8m up What 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 inxqc 1ze ya(csoyh7 ++/ front of a concave mirror, and the image is 3.0 cm in front +caxe(y1hy/+ co 7qzs of the mirror. What is the focal length of the mirror?

A. $15 \; cm$

B. $4.0 \; cm$

C. $2.4 \; cm$

D. $1.3 \; cm$

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10 cm in front g q7 n*5ec zbyi,fnxw/j g0id2,sj1uy ;zb j--of a concave mirror with focal length 3 cm. Where is theuf-0njgd1ig ;cyj,, i2/ wq n-jb7exzs5y bz* image?

A. 13 cm from the mirror

B. 7.0 cm from the mirror

C. 4.3 cm from the mirror

D. 3.3 cm from the mirror

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of hb9r/i5s51.f,vdd ) agdfnbr20 cm. An object is placed 10 cm ig5di1.srf hn5da9f)bb/ d vr,n front of 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 leng) on s-1vr 0nsitm3b)ath of 20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis3atm )-vsn )0rsobni1. 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 from9cxfenmxg3v6 6m0c ;b*0,w z* yv rpdq a concave mirror. The image is 4.7 cm tall, and 10 cm from the mirror. How tall is 0 9xd*0* rmm36qgv z,ccvep x;ywnfb6the 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 con1-e4nsf0c: (en ylgk ncave mirror of focal length 20 cm. The object is 4.0 cm tall. H1 e4cn-0n en(lg:ysfk ow tall is the image?

A. $1.0 \; cm$

B. $2.0 \; cm$

C. $8.0 \; cm$

D. $16 \; cm$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 47.5 cm tall. The image is 38.6 cm tall, and 14.8 cm from thq d.* m9 r.p z*zyemt8/ u-adhh;q)ikfe mirror. How faa9/q8*m kdq*h yzt)-. m u.hzief;rpdr is the object from the mirror?

A. $124 \; cm$

B. $47.6 \; cm$

C. $18.2 \; cm$

D. $12.0 \; cm$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.4 cm tall object is 4.0 cm from a conca,m5vl;e1a6 aw/ c0 md0gmcvzvve mirror. If the image is 4.0 cm tall, how far is it from thg5vem0m;vz1,6lwacc v d m/ a0e 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 mirrodfk ve8, 9sf9gr of focal length 20 cm. The object idve k 899,fgfss 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 cosmetic98 w b)kch p-w0hcczfcqql.x2)gpt .6 mirror (concave mirror), the erect image is twice the size of the object. What is c -b)gczhxw qp w t. q8hfl0ckpc.9)26the 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 coe.xul+m 1f7wrncave shaving mirror. If the image is an erect image 1urxl7f e+. mw1.5 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 concaz s4.kb7k a5j;s5 thudve mirror with focal length 5.0 cm. Where is the objech b7kj5u.tk zs5;d4a st?

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 4 g(5.blf/q47 q+m-tfecwpajjj,gjo length of -20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the im4 gw+4f f5l,-g/qc(jp7jm.ao qjt bjeage 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.ev-oae lty.sk/ u+d40 An object is placed 30 cm in front of the mirror on the mirror's axis. ./etey-+ 4duas v0lko 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 ii)o(*n .ichds s 5.8 cm behind the mirror. What is the focal length of the m c. oi*ihnsd()irror?

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 infxf q/,x 4lqy+hhoo 96 a15wns 7.80 cm tall, and 14.8 cm from a convex mirror. What 4 n faof+, xxq6olhh5/9q1n wyis 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 isrefyk;rr*xw:jq * 6- j the speed of light through ixyr :e*k-f w;r j6jq*rt?

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 s0j,+:3w9 wclrpdkzf 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 substanwx.duy p*:rilts0f .t2)1oh zce 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. The incoming ray is at an angle k e 6 iw9igrh qs7(9 c,ye5/elbos59vsof $17.0^{\circ}$ 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 ove j/ ftz:c0,hedr the surface of water on a windless day. What is0/h:ce t,jzdf 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 po .; yx9f*kfhfhnd of water. At what angle must the diver shine a beam of light toward the surface in order for a person on a distant bank to see it? (The index of refraction for ;ff.hkfx*h9y 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, strilk o 8ig+t+m,7 ,yt anrpgc7t/kes a plate of transparent material at an angle of incidencearc+kt igo,p/,7 t7g tn 8ly+m of $56.0^{\circ}$. It is observed that the reflected and refracted beams form an angle of $90.0^{\circ}$. What is the index of refraction of this material?

A. 1.40

B. 1.43

C. 1.44

D. 1.48

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97#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light traveling in air is inci;mxdz.+ oxv k.nao2) adent on a slab of transparent material. The incident beam and the refracted and.zao . 2kxvo x+m;)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 refrae0fypg)0f 0 t7edx09 cjbcos6ction of 1.46. Light is passing through it at c ye0 b0c6s0exto f djgp7)90f$53.0^{\circ}$. 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 crown glass (n = 1.52) inu 8w/o qvz*)wrto water (n = 1.33)uro8*) w/vwqz?

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 ife omkck15h+dwq6p. /s its critical angle of inciden/ .qmp5eh6 wokd1c+ kfce?

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 refracr) :vt( ia+fgjtion of 1.50. For what angle of incidence will light remainfgija +:)(vt r 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 is6zj 6ga86wx3 iug wm ft1s,qug++vi) i measured at $57.3^{\circ}$. Light enters from air at $45.0^{\circ}$. At what angle will it continue?

A. $34.7^{\circ}$

B. $45.0^{\circ}$

C. $53.7^{\circ}$

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

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103#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance from 6v8d y1:0yx,:la,ob6adrhhg7tik h j 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 long00jul yftee7/)um c y( and has a diameter of 20 mm. Its ends are perpendicular to its axis. Its index of refl cu/0j yuefm7t0(ye )raction is 1.30. What is the maximum number of reflections a light ray entering one end will make before it emerges from the other end?

A. 42,000

B. 26,000

C. 24,000

D. 18,000

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105#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 40 cm in front of a 20 cm focal length c)- xai x0s+hxqyob 3r.onverging lens. How far is the image of this obje)rxa0+ byx. xshq- oi3ct from the lens?

A. $40 \; cm$

B. $20 \; cm$

C. $13 \; cm$

D. none of the given answers

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106#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 12 cm in front of a converging lens with focal length 4 cm. Where 2ct:3 g mexbjgv7) / ouq.tgv1e 1j)hrij:7jgtqu/ hg. ev31c2 bmx1rv)o)g tes the image?

A. 8.0 cm behind the lens

B. 6.0 cm in front of the lens

C. 6.0 cm behind the lens

D. 4.0 cm in front of the lens

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107#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15 mm in front h onyr5s( odx19gns(1 izj*w.of a converging lens, and the image is 4.0 mm behind the lens. What is the focal zns(oh9i s jd 1r g.n5x1ow(*ylength 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 co(b xhb8e,d9gzx1 8mipnverging lens. If the image is 4.0 mm tall, how far is it from the lens? b,8gpxz(ehb 8x m9id1

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 fron:h/ ucu1l4irp cz.gq apa-p 97t of a converging lens the inverted image is half the siz gh4zpicac17 .q ar-lp/ :u9upe of the object. What is the focal length of this lens?

A. $13 \; cm$

B. $20 \; cm$

C. $40 \; cm$

D. $53 \; cm$

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110#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 mm in front of a converging lens wit9tswr)q,px:n l44q4x 2ux riyh focal length 5.0 mm. Where iss4 t,lx4nrxyp 2rqu wxq):49i the object?

A. 2.2 mm in front of the lens

B. 2.2 mm behind the lens

C. 9.0 mm behind the lens

D. 20 mm in front of the lens

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111#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 4.1 cm tall, and 1:n 4lxhqy wtu67:z 7 ae2ibgw(0.3 cm from a converging lens. The image is virtual and 6.2 7h6tzy : eu g(nia7:lx2wwbq4cm tall. What is the focal length of the lens?

A. $6.8 \; cm$

B. $10 \; cm$

C. $16 \; cm$

D. $30 \; cm$

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112#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15.2 mm ) 2 /lwgz)m5l9nqzye 0p-ftrnfrom a converging lens. The image is 4.0 mm tall, and 9.0 cm from /npy zr209tmqwfgll -n) )z5ethe 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 cini8, q)(r 1 bls/ofuqm from a converging lens, it forms a real image. When the object is o8(r iql u/,ni s1)fbqmoved 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 thin cj 0t4:r i,wueronvex lens. The lens has a focal length of 10 cm. What a,ujiw r0 e:4rtre 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-g o y6mo 8mt xpjt60x0;obep4 lens with a focal length of 10 cm. What is bo 6p0po0 y8m;etxmx6tog4-j 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 fro9e n-p t(,u(lrgx6 /p8tnoaix nt of a diverging lens with a focal length of 10 cm. What is the magnificationgl /n-8 (puo(,axxp nti 9t6re?

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 taszb p 3/3stn*qvpk8eir9yw/ :ll, and 4.8 cm in front of a diverging lens. The image is 4.0 cm from the lens. How tall vyr:8/s t* zpqne9iw3sk3p/b 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, jt( 6 61evxp37z (mc0pqmnhtl and is in front of a diverging lens. The image is 2.5 cm tall, and lv 16mp 67tjcmxe 3ztpn((h0 q7.5 cm from the lens. What is the focal length of the lens?

A. -6.0 cm

B. -7.5 cm

C. -13 cm

D. -18 cm

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119#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a u0o0qdmtzvt+)rh46j7 qpv e5 distance of 40 cm from a thin 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 lp 7) vz4o t+rqmt h56jd0ueq0vength 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*t j 5dk8cv05rtln2scs3n fn, the object be placed if it is to form a virtual image magnified in size by alr0n, nv2jt5csskc t*d3 5fn8 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 ezis 0mic6 f+:sea+48p6 iy jffocal length lens, such as is used in many 35-mm cameras, must an object be positioned if it is to form a e:if 6i 40s imy+z+c8jfse6a preal image magnified in size by a factor of three?

A. $46 \; mm$

B. $52 \; mm$

C. $58 \; mm$

D. $67 \; mm$

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122#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two very thin lenses, each with focal length 20 cm, are placed in contactad*ln o43+ sxd. What is the focal length of thiss x3+a4 dlndo* 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-c-uy.h3dj h/olonvex) thin lens has radii of curvature 46 cm, and is made of .hyhj /d- luo3glass of index of refraction n = 1.60. What is the focal length?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens made ofalyl; l.k+ad / glass (n = 1.50) has a radius of 40 cm on the front side and 30 cm on the back side. What is the foc alady+ll k;/.al 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 for+de+:tf3ubycu 7s;l 3qy; m g i)z6vnbmed by using a piece of plastic (n = 1.70). The radius of the front surface is 20 cm and the radius of the back surface is 30 cuylvdg; :t3f 3yns 7 cz+qu+m;e)bb6i m. 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 have a focal length of 40yqtti k.;udplow+t/ z 11r3y3 cm. It is made of glass of index of refractir d o+y;13ltq1.pt/ 3 uzwtkyion
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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