# Chapter 28 Physics

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question
When your eye is submerged in water, is the bending of light rays from water to your eyes more, less or the the same as in air? a. more b. less c. the same
b. less
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Identical rays of light in air are refracted upon entering transparent materials: A, water, where the speed of light is 0.75 c, B, ethyl alcohol light is 0.7 c, Crown glass speed 0.6 c Rank the materials according to how much the light ray bends toward the normal from most to least
Crown glass, ethyl alcohol, water
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The incident light ray, the reflected light ray, and the normal between them a. may or may not lie in the same place b. lie in planes that are perpendicular to one another c. lie in the same plane
c. lie in the same plane
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Object and image for a plane mirror lie a. equal distances from the mirror b. along the same plane. c. at right angles to each other. d. all of these e. none of these
a. equal distances from the mirror
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Diffuse reflection occurs when the size of surface irregularities is a. large compared to the wavelength of the light used b. small compared to the wavelength of the light used c. microscopic
a. large compared to the wavelength of the light used
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A surface that is considered rough for infrared waves may be polished for a. light waves b. radio waves c. both of these d. none of these
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It is difficult to see the roadway in front of you when you are driving on a rainy night mainly because a. of added condensation on the inner surface of the windshield b. the film of water on your windshield provides an additional reflecting surface c. light scatters from raindrops and cuts down the light to reach your eyes d. the film of water on the roadway makes the road less diffuse e. none of these
d. the film of water on the roadway makes the road less diffuse
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When light passes through an ordinary window pane, its angle of emergence is: a. always less than its angle of incidence. b. the same as its angle of incidence. c. always more than its angle of incidence. d. usually more than its angle of incidence. e. usually less than its angle of incidence.
b. the same as its angle of incidence.
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Light travels fastest in a. a vacuum. b. warm air. c. cool air.
a. a vacuum
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Atmospheric refraction makes the daylight hours a bit a. shorter b. longer in summer but shorter in winter c. longer
c. longer
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a mirage is a result of atmospheric a. reflection b. dispersion c. scattering d. refraction e. aberrations
d. refraction
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Light refracts when traveling from air into glass because light a. travels slower in glass than in air. b. has greater frequency in air than in glass. c. has greater intensity in glass than in air. d. has greater intensity in air than in glass. e. has greater frequency in glass than in air.
a. travels slower in glass than in air.
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At night an underwater scuba diver aims his flashlight beam toward the surface at an angle of 15 degrees with the normal. Upon emerging, the beam angle will be a. 15 degrees. b. impossible to predict. c. more than 15 degrees. d. less than 15 degrees.
c. more than 15 degrees
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When a light beam emerges from water into air, the average light speed a. remains the same b. increases c. decreases
b. increases
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Refraction causes the bottom of a swimming pool to appear a. closer to the surface than it actually is b. farther down than it actually is c. neither
a. closer to the surface than it actually is
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Different colors are dispersed by a prism because different colors in the prism have different a. directions b. frequencies c. speeds d. energies e. none of these
c. speeds
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Your image in a plane mirror is a. virtual b. real c. both of these d. neither of these
a. virtual
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Fermat's principle of least time applies to a. refraction b. reflection c. both of these d. neither of these
c. both of these
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A person standing waist-deep in a swimming pool appears to have short legs because of light a. interference b. absorption c. refraction d. diffraction e. reflection
c. refraction
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When white light goes from air into water, the color that refracts the most is a. violet b. green c. orange d. red e. all refract the same account
a. violet
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If the speed of light in a medium is 2×10^8 m/s, the medium's index of refraction is a. 0.5 b. 1.0 c. 2.0 d. 0.67 e. 1.5
e. 1.5
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As a light ray in air at 15 degrees from the normal enters water, it a. does not bend. b. sometimes bends towards the normal. c. always bends toward the normal. d. always bends away from the normal.
c. always bends toward the normal.
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Light refracts when traveling from air into glass because light a. has greater intensity in air than in glass. b. travels slower in glass than in air. c. has greater frequency in glass than in air. d. has greater frequency in air than in glass. e. has greater intensity in glass than in air.
b. travels slower in glass than in air.
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The average speed of light is greatest in a. orange glass. b. red glass. c. blue glass. d. green glass. e. is the same in all of these
b. red glass.
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A diver shines light up to the surface of a smooth pond at a 10-degree angle to the normal. Some light passes into the air above, and the part that reflects back into the water makes an angle to the normal of a. 10 degrees. b. more than 10 degrees. c. less than 10 degrees.
a. 10 degrees.
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A "burning glass" used to concentrate sunlight in a tiny spot is a a. converging lens. b. diverging lens. c. either d. neither
a. converging lens
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Different colors of light travel at different speeds in a transparent medium. In a vacuum, different colors of light travel at a. different speeds. b. light travels at the same speed everywhere. c. the same speed.
c. the same speed
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The type of radio waves that is diffracted the most around small buildings are a. FM b. AM c. Both diffract equally
b. AM
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The light in raindrops making up a rainbow has undergone refraction and internal _______. a. dispersion b. absorption c. scattering d. reflection
d. reflection
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You place a burning candle 60 cm in front of a convex lens having a focal length of +40 cm. Which of the following characteristics of the image can not be observed? a. erect b. larger c. located beyond 2F d. real
a. erect
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You place a burning candle 20 cm in front of a concave lens having a focal length of -80 cm. Which of the following characteristics of the image can not be observed? a. smaller b. all the choices are correct c. erect d. virtual
b. all the choices are correct
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You place a burning candle 60 cm in front of a concave mirror having a focal length of 60 cm. Which of the following characteristics of the image CAN be observed? a. inverted b. same size c. none of the choices are correct d. real
c. none of the choices are correct
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Specular reflection is common in the light reflected from _______. a. a mirror b. a common road c. this page d. a rough surface