Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images by mirrors and lewvaj8h5bb 550e b8r wunses has been successful de bb jb8u05 wv5rhe5w8ascribed 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 incidencktgqt( g7lcv5+2dwqs2 z .j6g;oo y4 he

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 mirrors 8p.1sq 9tgmjgwork is

A. refraction.

B. polarization.

C. dispersion.

D. reflection.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane mirror forms an vv7 bp0ob wf/svh7 d2,ka97lqu;ro,fimage 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 imagr;p yu 8zzhf(5sb l-f/es 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 rayibihi.+yv(sxc lc3*9 y1xn;fs do not actually pass through the image location, and would not appear on paper or film placed at that location is referred t n(3hy*9+xsb y lc1vc.iix ;ifo 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 ray-*0ull dyt2eqky 38r(pn 2ecys pass through the image location, and could appear on paper or film placed at the that locdy2n(3y e qrcl*-y2tule08 k pation 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 seeny2a7qvb8rk g 74 -qst 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 which refl-w v/5 ryqjct-s.woh ;ection takes place on the outer surface of the spherical shape is h/v5oq;y-s- wj. tcr wreferred 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 on the inne)fcj+ 5cutkhm 0jv( i6r surface of the sphere is referred to as a h)kticjfc(6v +0mj u5

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 ia;dlp2 pzu1 :es 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, n4,.sp:2aluaty ti ap-/frk /strikes the mirror's surface neaa/ ppty n,s faur:k-. ta2il/4r its midpoint. After reflection, this ray

A. again travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path parallel to the axis ov3;87tt g 7 cosnbtf+.zwow 6is 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 axb ae8l+w0wvt8q 32 1 hy.* mx5hccvqqais at the mirror's center of curvature before striking the mirror's surface. Aftexb vq2w eqh8l 1c.hqwcm5 v+*ya38 ta0r 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 throughh,9n 7dgjya +vgp y6-t the center of curvature is reflec6g ayy , -dthj7vg9pn+ted

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 sugs3 v)ftu*10lee rq6brface, crosses the axis at the mirror's focal point before s sf *ebu 0trle16q3g)vtriking the mirror's surface. After reflection, this ray

A. travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path through the focal cg eq ,c4sk6h-point is reflectek,e 6s c4-cgqhd

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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18#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three rays for finding the image position due to a cu+,ml.qlu 4e 4pyok,amrved mir + om.lylpq,,ekum44 aror.

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 1nygoa;9-vjx b. bq5tconcave mirror, exactly 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 of curvatup4+vjku;e8 p or8s5fjr(mhsai h+h 8ik.7r j *re. The image produced by the miurfes75j8;4 (a+8ri8o+* j v spkhi.h rk mhjprror 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 ce inmkcp3;,g8(a j )q ;rublfd(nter of curvature and its focal point. The image produced by the mirror is l(;u q3b(fa,lgncimr)8jk; p d ocated

A. out past the center of curvature.

B. at the center of curvature.

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

D. at the focal point.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is situated between a concave mirror's surface and its f u6(p5v)px4si+ pvhj socal point. The image formed in this case is+)xj 6 4puip(vp5vhss

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 o m(e1laouec2sh (;py+-5ciz kf a convex mirror, at the same distance from it as its radius ocz ;1ychlp+i(mo(2 ka5s- eeuf curvature,

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 itgx y1vdp*g; 8k)e+ *hs cfe-op as its focal len*pcx;s)g *-vho+y 81ep efkdggth,

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

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

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

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

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

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sometimes when you look into a curved mirror you see a magni2)m/ jy ypiz t*fcf(xr;nsn .+fied image (a great big you) and somet* y+xmr2/).nij(s fyzc ftn;pimes 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 mirzhw xh345y.do rors 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 produce images whi5ugx(ud:k(u 7sgb zc4ch

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 miwakbnhb:,0) i rror 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 kfxie0m9 17(sktx4er 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 fbx+m0u; blo -jca8 b(dor a mirror means

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

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

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

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

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

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance i; n6wj+geq.eb 5u j1fqq3zw) rs positive, 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 image1ptm4z0mas, ji o )1tson9nk,q x/ a,l 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 aa 9ki,2 xti) dtqgp9t, 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 vaq2l0q1 bjz.u gtqhf id-5i+d 7lue, 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 -*d suix ns1/wthe image isiw suns*x/- d1

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 q8a ht,n4nlm8 magnification is smaller than one, then the image ianq8,hm lt8 n4s

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 mi farg+sd4/yooyrhsze2: ) .;:ol pu-agnification 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 fastest );seid .k3 09isvxlo9dd9kbu4eo9xi

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 substafd ko961qx2 avnces, 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 medium would impfqsbm u )/f5c(1gk kwky3x)q.ly

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 s9x2jf* ghpj. diamond 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 incidenmk rdq;*07h+ssy ;ce bce

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 intej :-hq wi sji;3*k/kho 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 angl.. ryvci+ )gsie 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, is4 dw)q0 3okip+pq 3vct incident on a glass plate at a $45^{\circ}$ angle. The angle of refraction in the glass

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which fiber optics isqb w zt0p*oer res9v(55n f;/b 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 odt3 69w* :1jp8dzyd9s +mkbn v+rhdnaf 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 zyn*pp47i; ti 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/nanm+rgvdcyl5i9* 9 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 cenry;(4(/nse 0 cgwqjngter 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 thickqzqj:-vg5tcsy) h60s :y-wwmer at the center

A. spread out light rays.

B. bend light rays to a point beyond the lens.

C. have no effect on light rays.

D. reflect light rays back.

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two diverging lenses are similar except t0 (/5u wtusgivhat lens B is rated at 20 diopters, whereas lens A is rated at 10 diopt0/5 t u(gvuwsiers. 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 thj*k8lqlg*7 k;vf2h xx, wy2c *mduf1o the axis of a thin concave lens, strikes the lens near its midpoint. After traveling though the lens, th7 q2kj* m1w hhluffdx,clgx2 k*8v;*yis 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 parallel to the axis of a convex thin lens, b .l/vhol+7z jstrikes the lens near its midpoint. After traveling through tj v zlloh./7b+he 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 ima t 4ifvs+o6q vk7;5bgage position due to a thin len7a+vsk t 5oqf 6iv;4bgs.

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 fockri bf9e4jz)3l4lqbv.3q y4 h al 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 foc h)cflxu+0;qc, )yjrc al 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 4 akiofy.s 2r)xa)iw;1kraq ,focal length $f$. An object is placed at $f$ on the axis. The image formed is located

A. at $2f$.

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

C. at $f$.

D. between the lens and $f$.

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal .cbvta3:a3)/q)mp 93mqwben v vdgmb z.k u3.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 focafh;j yua+y t7 du-1g0jl 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 image formezdv -z uwp9l 1 o7th/qap;93zgd isl-zw qh/;pzgz3 d1p o7u 9t9av

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 conv z87;er*ad-mnejqq* cave 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 throughis6tv9 gj1sim,, p5mq 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 sblv -*g;4xx7x r rsd0a) nc9ymcreen is placed a converging lens of focal length 24 cm. The filament of the lamp can be imaged on the screen. As the lens position is v0y dlsa7cr)xg-rv9 bx;*4 mnxaried 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 length obtrijz(t9 +a /6;ygts $f_1$ 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-conve. e5wqaj8fdlf+o6eb8k ; -zkyx) lenses are placed in contact. If each has a focal length of 20 cm, how would you expect 8 k-qz 6fe.ywo8 5edb;kal+jf the combination to function?

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

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

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

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

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

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

A. converge.

B. diverge.

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

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

E. will travel back toward the light source.

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A laser beam strikes a plane's reflecting surface with an angle of qx.cy tycvr/ek;6q h - );3qmqincidence of q6hx tr- qmecvy;qyq ./k3c) ;$52^{\circ}$. 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 froni y4ho.ooa0h6kuj3e* d7er2 9t m4opxt of a plane mirror. The image formed by the mirroarje2o47.e ym4h3dtkhoo 6io9*0upx r appears to be

A. 1.3 m in front of the mirror.

B. on the mirror's surface.

C. 1.3 m behind the mirror's surface.

D. 2.6 m behind the mirror's surface.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far are you from your image when you stand 0.75 m in front of a t*dp0 ftb7fqo/1/ vc bhosq(5 vertical plane mirrf tvbcp5so0hf7*1b ( qq//tod or?

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 mirro8xc 2 2h :vhl*m ewb,9ddo;yejr at a c b,dyl edxehm:*29vhow; 82j 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 4nbopv: b 1yfzvc,,m; mirror has a radius of curvature of 20 cm. How far from the mirror is the focal point locatnm,cob ,;ypb:z41v f ved?

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 3)8zg+upiec + 63 5pnw pfxp:ao0 cm from the mirror. What is the object 65w g8ue o pp+np+)x:z3pacfi 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 th-y -p3pkfw y d4c4akd.e image is 3.0 cm in front of the mirror. What is t4 pyk-cddf4w.a3 p-ky he focal length of the mirror?

A. $15 \; cm$

B. $4.0 \; cm$

C. $2.4 \; cm$

D. $1.3 \; cm$

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10 cm in front of a concave mirror with focal lengthndqp.b7 kq2o4 3 cm. Where is the kq 74 qd.b2npoimage?

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 mirrmrtd . apl1o9,or has a focal length of 20 cm. An object is placed 10 cm in front of thepo 1td.9ar, ml 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 lb96nc5ua f)e sength of 20 cm. An object is placed 30 cm in front of the mirror on t 9ef 6)sn5bucahe mirror's axis. Where is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 5.7 cm fro tjjb w/ct4wb2aci r+w391yuc))s)onm r, v.dm a concave mirror. The image is 4.7 cm tall, and 10 cm from the mirrora).j b v4isr+wmwc1 trnj9)ucb 2),w3/ctd yo. 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 k: ta / ;csz* v8zzik3do sxb/4(rviv 4pbgn29cm from a concave mirror of focal length 20 cm. The object :4svnksz3/pa( t4z /vi;vi2o8cb * bdzx9rkg is 4.0 cm tall. How 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 tj s:k lz a4abv 0tz:qy4lm6q+6he mirror. How far is the object from the miryz j:0av6b+k4t:lql4qsmz a 6ror?

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 ly02h5+k ysw8 dtm bc5is 4.0 cm from a concave mirror. If the image is 4.0 cm tall, how far is it from the mirr 2 5w8hsy+l05tmdyc bkor?

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 c 3emsb(1di4xm38by(vb np (jcm from a concave mirror of focal length 20 cm. The object is 4ces3j4vibb8 ( (mpm 1(y ndbx3.0 cm tall. Where is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 40 cm in front of a cosmetic mirror (concave mirror), 7w56 4 yq-o4rmee.bycdlw yhxxr5 0h* the erect image is twice the sd4ehyxqr5r h 6e w5c 0ylo wy*4xb-m.7ize 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 ykz 60r. 4;8urh.z.tofkplvtimage is an erect image 1.5 times as large as the object, what is the mirror's focal leng zro0 th l.6v f8.kr.pky4z;utth?

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 wiqb.qv ) 5s-7lvp, x;re lisj8hth focal length 5.0 cm. Where is the q sxsv );lvbej85-,irhq 7 .lpobject?

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 p-4**sien1 s-yzn fuefocal length of -20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the image4ese1snyfn-- pz **iu 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 len/mt x-u0+6peny u prl*gth of -20 cm. An object is placed 30 cm in front0rupup n/*tm-l 6e+ xy 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 5akw9iiakiz qpaju/34h6 9wi7f*9or of a convex mirror. The image is 5.8 cm behind the mirrorzj79 ah4 9 u6aworp9/ 5i*kiwi3fiqka. What 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. The image is 7.80 oi;q :v.2blzpmrt .pj3k;th * cm tall, and 14.8 cm from a convex mirror. What is the mirrolmzht*qj;3rop2.k: pvi.bt; r'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 lif i a ;yj3,nkbcie2afg 2rx d(o:w1u3cg-rj-4ght thror3 g;j-o-: dbaurexikg c31j,n yf2c(i a2w4f ugh it?

A. $2.00 \times 10^{8} \; m/s$

B. $3.00 \times 10^{8} \; m/s$

C. $4.50 \times 10^{8} \; m/s$

D. $6.00 \times 10^{8} \; m/s$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray in air is incident on an air to glass interface at an angle 37 g v0i2xbrytr ly22pof $45^{\circ}$ and is refracted at an angle of $30^{\circ}$ to the normal. What is the index of refraction of the glass?

A. 1.23

B. 1.31

C. 1.41

D. 1.74

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance from a,hcq v8k0 -nmzq29fn jir 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. Thy)codx .4(o bde incoming ray is at an angle of $17.0^{\circ}$ to the normal. The index of refraction is 1.33. What is the angle in the water?

A. $22.9^{\circ}$

B. $22.6^{\circ}$

C. $18.3^{\circ}$

D. $12.7^{\circ}$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An oil layer that is 5.0 cm thick is spread smoothly anc3t ( 2p3j ject11lgovd evenly over the surface of water on a windless day. What is the angle of refraction in the water for a2p3vt1j 3(gtj e1lcc o ray of light that has an angle of incidence of $45^{\circ}$ as it enters the oil from the air above? (The index of refraction for oil is 1.15, and for water it is 1.33.)

A. $27^{\circ}$

B. $32^{\circ}$

C. $36^{\circ}$

D. $39^{\circ}$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diver is 1.2 m beneath the surface of a still pond of water. t351e ibhe 9k23gv1:tgtb jfzAt what angle must the diver shine a beam of light toward the surface in order for a personk e1 gfgt31iejbh t:9v3 tb5z2 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, strikes a plate of7hx+pqdidb ay0 0y,2i transparent material at an angle of incideny2hayi7,ddi+0xpb q0 ce 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 slab of transparent pe+ 78s8mnr bqmaterial. The incident beam 8r7s8p+ ebmqnand 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.syl9x a(jgf bx7t34( k Light is passing through it at j(x tlyfk9( agsxb473$53.0^{\circ}$. 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 lig,2 ,hwcj1v*de mfck(d:g h)adht traveling from crown glass (n = 1.52) into water (n = 1.33d: v)hcfk1jw ca(dmh*eg, 2,d)?

A. $42^{\circ}$

B. $48^{\circ}$

C. $57^{\circ}$

D. $61^{\circ}$

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100#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lucite has an index of refraction of 1.50. What is its criz 9k x ycv0wgp0p:9r6ptical angle of incidencegpcv90p k ry69:z0pwx ?

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 *y*73mvdv7jq;cj i uhhyf82drefraction of 1.50. For what angle of incidence will light remain within the plastvhc 2d*m;iv7d8juyqy7fhj * 3ic "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 s;1xmprw7j l:zds+gw 8ubstance is 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 a+kix)--z qyqu;iqt5 y7 hkum 3ir at $30.0^{\circ}$ to the normal. It continues through the substance at $23.0^{\circ}$ to the normal. What would be the critical angle for this substance?

A. $53.0^{\circ}$

B. $51.4^{\circ}$

C. $36.7^{\circ}$

D. $12.6^{\circ}$

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104#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optical fiber is 1.0 meter long and has a diameter of 20 mm. Its e3(up*v5 o:4keqehqr9lw bj : cnds 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 will9qev:rj(ke35bluo h4q* :cpw make before it emerges from the other end?

A. 42,000

B. 26,000

C. 24,000

D. 18,000

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105#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 40 cm in front of a 20 cm focal length converging lx0tbq)y7c -q2v7bp rcequ73 yens. How far is the image of this obpvry3t ec) y7qb7 b7qu0cx2-qject 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 conver21-mz4nl6jx ndv ;gcl ging lens with focal length 4 cm. Where is thl;42nz1xlc- dm6nv jge 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 cq6zxxmxk .bae 8 j9u5;onverging lens, and the image is 4.0 mm behind the lens. What is the focal l e;58q um9bkx x6.zxajength 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 q q y.yog a.871tok)ymmm from a converging lens. If the image is 4.0 mm tall, how far is ig yk.y t.)yo8qa 7qm1ot from the lens?

A. $14 \; mm$

B. $8.7 \; mm$

C. $1.4 \; mm$

D. $1.1 \; mm$

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109#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is 40 m in front of a converging lens the invertexh+c n ta.cwg/ )qg+:dd image is half the size of the object. Wx+a c)q w/n:cdhgtg .+hat 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 con/mnpf) +j.h os t4ag:averging lens with focal length 5.0 mm. Where.tg jf4m)pao : nas/h+ is 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 tallpo.t 6;6ayex zs)(v pu, and 10.3 cm from a converging lens. The image is virtual and 6.2 cm tau.x) vpopa ;zt6y6 se(ll. 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 ai v 08lq8lvqz:,ui4n8e t kp9k converging lens. The image is 4.0 mm tall, and 9.0 cm from the lens. tuvq88 8zple,l0k4knvii:9q How tall is the object?

A. $6.8 \; mm$

B. $5.4 \; mm$

C. $1.7 \; mm$

D. $0.68 \; mm$

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113#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is placed 60 cm from a converging lens, it forms a rme0yyk 2 *f4 :nd.x;p obznzt/eal image. When the object is moved to 40 cm from the lens, the image moveznx0t d em/2f.4:pyn ykbz;*os 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 convex lens9lnhx5tne 0v 3. The lens has a focal length of 10 cm. What are the l3hvetx 905n nvalues, 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 e / 5jbjrp/ dx4flzo2)e3p f6uin front of a diverging lens with a focal length of 10 cm. What is th 62ld/4jzrfpb5f p)xe e/ou3j e 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 mnq q(;ia0 0pe30 cm in front of a diverging lens with a focal length of 10 cm. What i ;0qpnae(mqi0 s 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 tall, and 4.8 cm in front of a diverging lens. The image m exce9,s m-c.5u lyx.ixs5c .,luy .eemxcm -9s 4.0 cm from 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 d/myh;chu5 ;9dkbaz:+f nlqm 2iverging lens. The image is 2.5 cm tall, and 7.5 cm from the lens. What is the focal length ofhfm:+ q 5dk92 ;h;yazun lcb/m 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 a xa.hu* u .+ hqotqo0:avirtual image forms at a distance of 50 cm from the lens, on the same sat x.oaohqu+:. 0*h uqide 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 object bet) (z f2dzv8x,g8cai4j f4khj placed if it is to form a virtual image magnified in size by a factor of 48(a zjfhjt 4,c f2k)dgxvi z8three?

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 ij4i lpu +; nxdfbw4o1-s used in many 35-mm cameras, must an object be positioned if it is to form a real image magnified in size by a factor of tj4ni;lfbu1ow xdp4- +hree?

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 witnhz3noo(h2 7 ild):iqd0 8mbd h focal length 20 cm, are placed in contact. What is the focal length of thism)qb odh(:hl 3ndiz 8i0o2n7d 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 radii ofm/*w4d)9dfwsdvg pry0 *z z/d curvature 46 cm, and is made of glass of index of refraction n = d/z4srzg)/p9dv w*mdf0 d *yw1.60. 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) has a radiu yx1r v4n q:jg)8-8)kxin mtqns of 40 cm on the front side and 30 cm on the back side. What is th rnvnt :8qx 8-nqgjkiym4) )x1e focal length of the lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by using a piece of plastic (n = 1.70)b.qti-qnz djef/h..wlmymfm)8o(9 p c8 )dt,. The radius of the front surface is 20 cm and the radius of the back surface is 30 cm. What is the focal )ycjnfq(limm/,p8w . 9 b)t. d-.hdmq ftz8eolength 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 40 cm. It is made of glass o b4e9bab/ew2d(i s/kdlh d5 u3f index of re b3idks2bd59/leduh 4w b(a/efraction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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