Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images by mirrors tn j+ ry;yo.w/m-m 2znand lenses has been successful described n; -t2rn wy.o/ymmzj +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 incidenced -mwz 5w1+es8yxartsfk5dt8 9qm2d 38 m/yme

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 mirroria j,)+d)jwae q: un2icmb s8g*a-i 7qs 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 forms7x 7 93bqt3m xjtko w)zk,9yzg 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 imag5nybng/npy8kp i) ec/7 bt. 1oes 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 nogeb.4s7 p ;wm6r zn2,smezg+u t actually pass through the image location, and would not appear on paper or fi;zm6eun psb2re wg+s, .gz7m4lm 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 through the imag.ldha-f6(,ien; nr +za d7sm .e.kbii e location, and could appear on paper or film plaamf(-+ iz.,.h.ls e 6bn iedkn ia7;rdced 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 see a virtual 9lir+l e2r7by q-zql: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 whc u0*jherd)x t,95 nvadw1zm*ich reflection takes place on the outer surface of the spherhw5rz9utc,dv d)e m* xa*j01nical 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 p:zd2 p26+9qd +abw fckyvyvg 4lace on the inner surface of the sphere is referred t6kadyb y49cvq2g2zv+pw :+ dfo 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 le +e9s )vwx2b.iob: xp8iwom2p ngth 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 concave5,b)wbw nl6a jnvex2+mbg8 t0 mirror's axis, strikes the mirror's surface near i )vn5gabx t0nw 8b+jl6e,2wb mts 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 czg3 +/o8ch2dl8hxq kponcave mirror on a path parallel to the axis is reflected

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a concave mirror's axis, crosses the +, .e*p*ya ;c + yublv4jxudhvaxis at the mirror's center of curvature before striking the mirror's surface. After refluu+ cpa 4b+ldvxe*vy,hj.y *;ection, 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 ce3y:y1qg6h7w0wi2ca wy /2pa y atun t(nter of curvature is ref: w gwwa02(/p a1y6yt3athy7n 2c uqiylected

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 concavgv:5v:rf 2;)td y qeinmbn+ 8fe mirror's surface, crosses the axis at the mirror's focal point before striking the mirror's surface. After reflection, this raymi)qrfvf:bt;g5dnn :8v+ y e2

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 poinh /qjrq3i4 9-ckvxyf 5t is reflecteiq3k xyj/vq5h-f 4rc9 d

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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18#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three rays for finding the image posi6yj5gqez5qa7e lm73: u;bkm dtion due to a curved ;akq6g 5ul:3z5ee qd m ybj77mmirror.

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, exabw( (fg,eg:mg 70tktm ctly 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 aga1 hm2ep ;gy8g)q 6z,a*i vea+kqt2x concave mirror's center of curvature. The image produced by the mirror is loca+a ;eghek8 qgap x q,1*tygm2zvi6)2 ated

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 curvature z1yf,;gld js15w)kxb and its focal point. The image prjl5g 1dzxysk ,)wf1b; oduced 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 9z ajaw(.) oxzbetween a concave mirror's surface and its focal point. The image formed in this case i( zxo)9waaj. zs

A. real and inverted.

B. real and erect.

C. virtual and erect.

D. virtual and inverted.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror, at the same distance frombrj.7w9x7p, ,vxkc a r it as its radius of cub,pw9j . krrxvcax7 7,rvature,

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 its8 )5s. q rhv3yg m17ubxn*spxcc6w y.l foc qs6cx*lchwy51. rngx.mpv s8bu73)y al length,

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

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

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

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sometimes when you look into a cu*-u m-3 jhf ..7tbzvetyf0zeprved mirror you see a magnified image (a great big you) and sometimes you see a diminished image (a little you). I.e7 teumvh.p3 b- ztj y0-zf*ff 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 mirrme+p, o,zbjit/ nns1/ors 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 sjw3 :4uo,xgz:iudo3*o u o;m//vh)k 6q z uizproduce 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 p hbwmdt(7 q6gsc,sbwy1- t30uroduces 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 sphew8)f9xiu (- 67aghj: qmxid ufrical mirror produces an image which is

A. always virtual.

B. always real.

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

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

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnification for a mirroru133 ge;x*x l+nor.)il vtazs means

A. the image is inverted, and the mirror is concave.

B. the image is inverted, and the mirror is convex.

C. the image is inverted, and the mirror may be concave or convex.

D. the image is upright, and the mirror is convex.

E. the image is upright, and the mirror may be concave or convex.

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is positive, the image formed i/s cx 5nxnp7dixu2+p: s

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 fors,,bhvcc8 g9gv:k e:5 tu6ryzmed 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 x-pxcorr)/l/ta *j i( 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 negativeao gd/8fwkn9x jf7(3 c 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 magnification is larger than one*a94 mxjisz *(qralt) wzj38t, then the image isr 3at q( s w8*4zlajt)i*zmxj9

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 magnifi z01+j*jb x(z8s:twdhaf8l+v h 1 xu*fdj7qilcation is smaller than one, then the image i*81wz hi:l0fvjhb1+j 8f(uzqt+ dax7 xsld*j 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 magnifis ey(s9saro+ydq 4 c ge+86b4ecation 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 fastesth rg4 hgw73.ja

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 substancesh(mjtsue5p 2,)ynjk *, the index of refraction

A. is less than 1.

B. is greater than 1.

C. is equal to 1.

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An index of refraction less than one for a mediuxu2ph .9u 7pqom 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 diamond is /kb3c.tr+p+s+ a 9fwq 8osm kz$2.42$. 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 inciden*m.m41wqw6 bbg -iijxstx(v.ce

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 int2qkuxo.z )dkj,f8 y *uo 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 refraction ;lnqtat*;w4qt+ iq6 xwill 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 +qb 2vr.kr4ejincident 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 optics 6zctc ye wqo /7:nf0+,n9dwo ais 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 e9h1pdje5 q n3 as7r*vof light passing from water into air is $48.8^{\circ}$. This means that all light rays with an angle of incidence greater than this angle will be

A. absorbed.

B. totally reflected.

C. partially reflected and partially transmitted.

D. totally transmitted.

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which lenses work ismbpk+09 i0k w/7eudx0jz4 xrt

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 th/02 k; d4 c4fotece* iaycr(h.r1beuje 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 (, wa+5 x)epw4mxs zv0yu1gyythe 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 th(zw 4t;emo1cl3) xirv 90vtzve 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 lenses au8t/g wv /lhb o9uq,j)w l6ie)re similar except that lens B is rated at 20 diopters, whereas lens A is rat, ) lbhvjql 96/g)i8twoweu u/ed 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 paralm261lvm) qynzlel to the axis of a thin concave lens, strikes the lens near its midpoinz) 2vmql6m1 nyt. 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, travelin* 9wr y-vka*. +rsgp3me h4njag parallel to the axis of a convex thin lens, strikes the lens near its midpoint. After traveling throaw9 h s*gpm*era-kr.j+ n43 vyugh 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 image position due to a .:ryul-;lj8r3n xbywthin le8l-:.nl ; yjxubyw 3rrns.

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 focab9vz7yy k5 ;5 a;jhxehl length $f$. 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 length d+5(thiyeuc: $f$. 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 lengt2ld3t95 7 h,iqn y lr64evbeapfc /2mfh $f$. 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 f .a 0xqcghr26eocal 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 focal b*w axeyaoon5g/ m ;ruy76d0a: rhe6 7length $f$. 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 betwec 2rovjhj2 7-bkj7z n;en a convex lens and its focal point. The image formed is - k;nr72zj ovbj2jh7c

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 l/quqt8w enm95l8:9fp)lr ky penses

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 owu+no3zu)- ua 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.+q nsgqu,/wp / Between the lamp and the screen is placed a converging lens of focal length 24 cm. The filament of the lamp can be imaged on q/nqw+gs /p, uthe 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 foca3pk mv(brnn/mk+ 4u1t8qfcvj1i2s2 k 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 (cona c ;u )oyow+b8di3a2uvex-convex) lenses are placed in contact. If each has a focal lengtd ya)c+a o o;32bwiuu8h of 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.(/bot k o*hp3dp;g rfo3 srd3's reflecting surface with an angle of incidence of htdkd/gobrp3 o;f.* 33( rops $52^{\circ}$. 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 f.kd .+jdks +p)02y - xwcu8mn gxn0lkby the mirror d2mn.kd+8+pj )ns-0 .cyx 0wx lfukgkappears 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 0.75 m in front of aeqvy.;fs 51havik3 (p si7i+t vertical plane mirror?ha.sv5(fy +k ii1qt3p7i; sev

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 approacu 9xa. lh sy6s;zn7l6sh a vertical plane mirror at a speed of 2 m7zy6 ;ll9a6xuhs .nss /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 jmajm ub5p3: h9tfw9:20 cm. How far from the mir mw:m :9j9tu3aphfbj5 ror 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 m nff7dgf-k un8- ,d5pltk.8v7 uhm 5rimage 30 cm from the mirror. What is the object dt7 pr 8hmdugvl f75- f.u ,fdnkmk8n-5istance?

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 imag ; a4rwnd4p8i cx8yb8je is 3.0 cm in front of the mirror. What is the focal length of thxa8 nyp48 r8cwid;4jb e 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 concagj)be;x r sx2 *u)ogk0b7uqw:ve mirror with focal length 3 cm. Where is tgr)wx u kso jqe:2)xbu 0b7;g*he image?

A. 13 cm from the mirror

B. 7.0 cm from the mirror

C. 4.3 cm from the mirror

D. 3.3 cm from the mirror

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of 20 cm. Anqx r)tqrc8- ztf.x 8b- object is placed 10 cm in front oft qrtzc.x8q8 rx)--fb the mirror on the mirror's axis. Where is the image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of 20 c; 5ieta x y-s5czua6htnp(, 5pm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the image l -6p;sp,x5hc (ey ian5t5atu zocated?

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. Therhoyw0h ea but6t81ob+w 69lfjw r/:/ image is 4.7 cm tall, and 10 cm from the ulw/h +t r 9oaj8w0yebothf /b1r66:w mirror. How tall is the object?

A. $12 \; cm$

B. $11 \; cm$

C. $8.2 \; cm$

D. $2.7 \; cm$

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm d..xw51fc1w z ;z;.hmwfckdx from a concave mirror of focal length 20 cm. The object is 4.0 cm tall. How tall is the imazcwxzkwhd1;dw 1..; 5cf. fmxge?

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 thn *2x8td upe6ie mirror. ut6 e82xni dp* How far is the object from the mirror?

A. $124 \; cm$

B. $47.6 \; cm$

C. $18.2 \; cm$

D. $12.0 \; cm$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.4 cm tall object is 4.0 cm from a concave mirror. If the image is 4.0 cm tahvj3;nz 1o3hxll, how far is it fromhz 3;jvhx31no 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 ashg/ t.wb/i.en)y n-o concave mirror of focal length 20 cm. The object is 4.0 cm tall. Where is the)i.eoy btn gn./hs/-w 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 mirror), the ecc7h (yx-t(mqg;1 j((gj vhh irect image is twice the size of the object( 7c(xihj (g;ghv-hcq(t1mj y. 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. Ifgl1l*s gl2e w( the image is an erect image 1.5 times as large as the object, what is the mirror's focl sg *lw(g2le1al 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 caba ,mw;3;oywith focal length 5.0 cm. Where is the yab,;w3 aco;mobject?

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 l/a4y5 yv9+nzam,k xg or.n,h a focal length of -20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where isonhg/myv +9xz l4a,,an 5yrk. 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 object is qw weooxb4u)y1-d a,mp5y:d*placed 30 cm imd,x o yq 5w*4pow-b)ed1uy:an front of the mirror on the mirror's axis. Where is the image located?

A. 12 cm in front of the mirror

B. 60 cm behind the mirror

C. 60 cm in front of the mirror

D. none of the given answers

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 14 cm in front of a convex zt zw9ar )y(qenn5 62mmirror. The image is 5.8 cm behind the mirror. What is the fonzmyw9nr62eazq )t5( cal 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 tav )swadlr4k t 2/fy9p46vs (jfll. The image is 7.80 cm tall, and 14.8 cm from a convex mirror.kw/ f a2f svrv6s4pl)9jt4d(y 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 frx-*ebv;)x)io9 gmq index of refraction of 1.50, what is the speed of light thr g*)ire fvo9m;x-qxb) ough 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 i iy.l 89 ;tjs;bdr6;ni6wayr yncident on an air to glass interface at an angle of $45^{\circ}$ and is refracted at an angle of $30^{\circ}$ to the normal. What is the index of refraction of the glass?

A. 1.23

B. 1.31

C. 1.41

D. 1.74

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance f *v0hcd*bxp n njkj, 4l;6d,ocrom 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 of, v*:,xt7s1wxuy pqic cght8/ $17.0^{\circ}$ 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 a 28y4;tw vgkgvnd evenly over the surface of water on a windless day. What is the angle o;gv8t2kg4vwy f 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 surfaf/uu 6pequ+3nce of a still pond of water. At what angle must the diver shine a beam of light toward the surface in order for a person on a distant bank to see it? n uq 3uf+eup/6 (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 a-/fn9ai;wmqih8wnr(+ ; sa hwir, strikes a plate of transparent material at an angle of incidenc 8-9m ni hr ina;(wswfh+/qwa;e 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 slamm4;7 ig,(vlm0 fnlamb of transparent material. The incident beam and the refrvfmm m;m lg7,i(a40nlacted 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 refractis j e g+gzm 9d-iy-dep.88ww4ton of 1.46. Light is passing through it at gz 48md i9 .g-teydep8sjw+w-$53.0^{\circ}$. 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 lightl:6sq nxe2 vavx8d9.c7m /udu traveling from crown glass (n = 1.52) into water (n = 1.3n. 6xe/u m cddalx27v u8s9q:v3)?

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*o,6fy h ae3n zyyxvm 0c949g jwaqi/. of 1.50. What is its critical angle of incidezmiyjw.0y 9*ao gey ,fnh9q/3c4 6ax vnce?

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. For zcqln 4;q73ly,el k*sge/.sr what angle of incidence will light remain wiqgelsky,3c nr.; /sq4 ll7e *zthin 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 measr. jyawi d/2zo*v y07lured 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 dbo2hbc(,f3t zl 4(fa40+lhdfpvkq, 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 meter long and hasxgii lvc13t89d;k l4n a diameter of 20 mm. Its ends are perpendicular to its axis. Its inxkl c v8gidi9143lnt ;dex of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make before it emerges from the other end?

A. 42,000

B. 26,000

C. 24,000

D. 18,000

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105#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 4 :)td a85 jun dx6fchivw n;6g7:+fhys0 cm in front of a 20 cm focal length converging lens. How far is the image ofv:f+ny 7awtj6nfh6 u5d ;s)d8ih gx :c this object from the lens?

A. $40 \; cm$

B. $20 \; cm$

C. $13 \; cm$

D. none of the given answers

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106#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 12 cm in front of a converging lens with fonuvs:qg)q)8 ; 2ufswccal length 4 cm. Where is t:suwv)2 f)n8cgsuqq ; he 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 iv*z i/*0w(1m y,qzu)by hljjconverging lens, and the image is 4.0 mm behind the lens. Whayjzz*0j1huiml)q i , w*y/v(bt is the focal length of the lens?

A. $11 \; mm$

B. $5.5 \; mm$

C. $3.8 \; mm$

D. $3.2 \; mm$

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108#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 14-mm tall object is 4.0 mm from a converging lens.fo. ab4mp)9/hn 9xbpis*gfv8 If the image is 4.0 mm tall, how far is it from the pmn). 4ph8*fsfgbova /x9bi9 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 ofobx:ti3-3 p kpz8t)t5fjbj )c a converging lens the inverted image is half the size of the object. What is the focal len) ko58z:tt x3b) jipp jc3t-fbgth 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 wmn dtw8)o) fp8r9 f;;a yvnm-aith focal length 5.0 mm. Where is the ob 8nffmm );w9 od8pr-)yant;avject?

A. 2.2 mm in front of the lens

B. 2.2 mm behind the lens

C. 9.0 mm behind the lens

D. 20 mm in front of the lens

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111#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 4.1 cm tall, and 10.3 cm from a converging lens. The image x,v;lmz:n 4jwis virtual a,lv jwmz4 ;:xnnd 6.2 cm 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 from a converging lens. The image is 4.0 tw uql lbk*od752dorn .59sxce95vi5mm tall, and 9.0 cm from the lens. How tall is the iokxw cdd59u*ln5.es95q rb7o l2tv5object?

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 4(r ogrsbq85eui h( /(uj+qbw)xh- bqimage. When the object is moved to 40 cm from the lens, the image moves 10 cm farther fr (ru5/gbh)r(w h 4e(+q oqsu-ib8 bqxjom 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) w8 k:fl1e5llwt lrw4,75wgekiq+an a thin convex lens. The lens has a focal length of 10 cm. What are the values, respectively, of the image distance and lae5w :tf nir 8qgl4a1 ekl5l)wwl,w7k +teral 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 szl. cfk;/fg3s y:.ot 4-cjgl a focal length of 10 cm. What is -y zlscjk tfs4l.3og:./cg ;fthe image distance?

A. $7.5 \; cm$

B. $-7.5 \; cm$

C. $15 \; cm$

D. $-15 \; cm$

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116#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front o; 85u pv,cwg p;/mb9qckz0kkqf a diverging lens with a focal length of 10 cm. kzc,pbp 0q5;uwkm9q c v/8;kg What is the 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 tax :uc(pku /sqe,;c09lv qkjb) ll, and 4.8 cm in front of a diverging lens. The image is 4.0 cm from the len;ukbcv0,sql k / ejpcxu9 )(:qs. 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 divey(kilo)fj/p c ;s0u ct,bz)(erging lens. The image is 2.5 cm tall, and 7.5 cm from the lens. What is the focal length of tht/cp jl(0,oib ); )yuefcskz(e 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.-qvp3di*s 6 ;;8zwffvhoudr 4 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 lengt;o f uviwdsd8z*;f43-v hrpq6h 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 mmy4 tydsj.2)ec(j-5jhm z v53ctq o* dm must the object be placed if it is to form ad mq) v my2tjh3j j*cozscyt45e.5 (-d virtual image 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 fom. wnxd6gw i1(t6+ fnjcal length lens, such as is used in many 35-mm cameras, must an object be positioned16ndign(+wwx.m 6ft j if it is to form a real image magnified in size by a factor of three?

A. $46 \; mm$

B. $52 \; mm$

C. $58 \; mm$

D. $67 \; mm$

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122#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two very thin lenses, each with focal lendge*mq4;-r ssgth 20 cm, are placed in contact. What is ths;e* -m srdq4ge focal length of 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 (conh*2 vacuf j5-5y9 mca )2wbnduvex-convex) thin lens has radii of curvature 46 cm, and is made of glass of index of refraction n = 1.60. hau*nbjvcyc- m295faw2 5u) d 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 gla .do0+tlu anbf9ffp6h52q;/*bcgn zfss (n = 1.50) has a radius of 40 cm on the front side and 30 cm on the back side. f;bu*no q6.c bg0 9dp +a2hzlf5/ tfnf What is the focal length of the lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by using a piew f(hbyr,em 08wx5+ umll3(tjce of plastic (n = 1.70). The radius of the front surface is 20 cm and the radius of the back surface is 30 cm. What is the focal length of the lmfr lw50 y(jxe8,tluh (3wb+mens?

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 40 cm. It is madhfl tt/ad:: n:e of glass of inde dt:::ah tf/lnx of 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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