Physics1410_Chapter_17_practice_questions

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Chapter 017 Light and Image Formation 1. When light enters a medium with a higher index of refraction it A. is absorbed. B. is bent away from the normal. C. is bent towards the normal. D. continues in the same direction. 2. Light is refracted as it crosses the interface between two different media because A. it changes speed. B. it changes frequency. C. it becomes polarized. D. it loses energy. 3. When light is reflected from a smooth, plane mirror A. most of the light is scattered into multiple directions. B. the angle of reflection is the same as the angle of incidence. C. the light is changed to a lower frequency. D. the wave characteristics are predominant. 4. The image produced by a single diverging lens will ALWAYS be A. inverted and real. B. erect and virtual. C. erect and real. D. at infinity. E. inverted and virtual. 5. A converging lens A. always has a real image. B. refracts all light toward the focal point. C. always has two curved surfaces. D. is thicker in the center than the edges. 6. Which of the following lenses is a diverging lens?

A. A B. B C. C D. D

7. Light from the sun passes through a converging lens and forms an image at A. infinit y. B. the focal point. C. the center of the lens. D. the center of curvature of the lens. 8. A plane mirror will always produce a A. real, erect image. B. virtual, inverted image. C. real, inverted image. D. virtual, erect image. 9. A shaving mirror and a make-up mirror both magnify the image. Thus, these mirrors are ___________ mirrors. A. concav e B. conve x C. plan e 10. The focal length of a glass lens depends on A. the curvature of the surface of the lens. B. the index of refraction of the glass. C. the intensity of the light passing through the lens. D. both the curvature of the surface of the lens and the index of refraction of the glass. E. both the index of refraction of the glass and the intensity of the light passing through the lens. 11. The cornea of the human eye is an example of a A. converging mirror. B. diverging lens. C. convex mirror. D. converging lens. 12. The rearview mirror of an auto bears the legend "Objects in mirror are closer than they appear." This mirror is a ______ mirror. A. concav e

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B. conve x C. convergi ng D. plan e

13. In the primary or inner rainbow, the A. outer edge of the bow appears red and the inner edge appears blue or violet. B. outer edge of the bow appears blue or violet and the inner edge appears red. C. outer edge of the bow appears yellow and the inner edge appears green. D. pot of gold is always at the left end. 14. A ray of light moves from air into water. Which path most accurately shows the refraction? A. A B. B C. C D. D E. E 15. A rainbow shows separate colors of the spectrum because, at raindrop surfaces, A. red light is bent more than green light. B. blue light is bent more than red light. C. green light is bent more than blue light. D. all colors are bent the same, hence the separation. 16. Convex (converging) lenses are worn by A. a farsighted person to make rays from a distant object diverge more strongly. B. a farsighted person to make rays from a nearby object diverge less strongly. C. a nearsighted person to make rays from a distant object diverge more strongly. D. a nearsighted person to make rays from a nearby object diverge less strongly. 17. A fish looks up through the smooth surface of the water at a bear directly above it. To the fish, the bear appears to be A. further away than it really is. B. closer to the point directly above the fish than it really is.

C. exactly where it really is. D. The bear cannot be seen by the fish, due to total internal reflection.

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18. A woman 1.6 m in height wants a plane mirror so that she can view her full height. The minimum vertical size of such a mirror is A. 0.4 m. B. 0.8 m. C. 1.6 m. D. 3.2 m. E. impossible to say without knowing the viewing distance. 19. A ray emerges from water (n = 1.33) into air. The light ray will A. emerge in air at the same angle as in the water. B. bend toward the normal on the air side. C. bend away from the normal on the air side. 20. Suppose a fish is observed below the surface of a lake. The distance the fish appears below the surface when looking down from above into the water (n = 1.33) is A. less than the fish's actual distance. B. equal to the fish's actual distance. C. greater than the fish's actual distance. 21. An object is placed 10 cm in front of a concave mirror of focal length 20 cm. The image will be formed A. 20 cm in front of the mirror. B. 20 cm behind the mirror. C. 10 cm in front of the mirror. D. 10 cm behind the mirror. E. 0.05 cm behind the mirror. 22. The image of an object placed 20 cm in front of a concave mirror of focal length 10 cm will be A. real and inverted. B. real and erect. C. virtual and inverted. D. virtual and erect.

23. An object is placed 15 cm in front of a diverging lens of focal length -10 cm. The image will be located A. 0.167 cm in front of the lens. B. 3.0 cm behind the lens. C. 3.0 cm in front of the lens. D. 6.0 cm in front of the lens. E. 6.0 cm behind the lens. 24. A nearsighted person requires glasses with lenses that are A. converging, to see near objects. B. converging, to see distant objects. C. diverging, to see near objects. D. diverging, to see distant objects. 25. While looking into a mirror, you notice that the image of a tree is projected onto the back of a chair (the positions of the tree and image are shown below). You must be looking into A. a concave mirror. B. a convex mirror. C. a plane mirror. D. a negative mirror. 26. An iPod is 20 cm in front of a flat mirror. You see the reflected image and must refocus your eye, perhaps even take off your eyeglasses, because A. the image is inverted but virtual. B. the flat mirror replaces the object in a random direction. C. the image location is 20 cm behind the mirror. D. your retina has a different curvature than the flat mirror. 27. Total internal reflection can occur when a light ray moves across a boundary

between different materials in which direction? A. from a material with a slower speed of light to a material with a faster speed of light. B. from the material with the faster speed of light, into the material with the slower speed of light. C. exactly perpendicular to the surface, no matter what the indices of refraction. D. parallel to the surface, but only if the ray is polarized. 28. The focal point of a lens is determined by A. the index of refraction of the lens material. B. the shape of the two surfaces of the lens. C. both shape and index of refraction. D. only the shape if you have a negative lens, otherwise only the index of refraction. 29. The image formed by a concave mirror when the object distance is greater than the focal length is always A. rea l B. right side up C. virtu al D. at a distance greater than the focal length 30. A curved mirror that cannot produce a real image of an object is ______________________. convex 31. Parallel light incident on a positive lens will ___________ as it emerges. converge 32. The magnification produced by a plane mirror is ____________ (sign and magnitude). +1 33. Light passing from glass into air bends _________________ the normal to the surface because it is traveling ____________ in the glass than in air. away /slower 34. An object is placed in front of a concave mirror. The object is farther from the mirror than the focal length of the mirror. The type of image reflected from the mirror is __________ and the orientation of the image is ___________. real, inverted

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