Exam 3--PHYS 151--S15
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1 Name: Class: Date: Exam 3--PHYS 151--S15 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Consider this diagram of the eye and answer the following questions. Which is the part that changes the focal length of the lens? a. (1) d. (4) b. (2) e. (5) c. (3) 2. At this part of the eye, most of the refraction of light occurs. a. (2) b. (3) c. (4) d. (6) 3. This part carries electrical signals to the brain. a. (4) b. (5) c. (6) d. (7) 4. This part of the eye is called the lens a. 1 b. 2 c. 3 d This limits the amount of light that enters the eye. a. 2 b. 3 c. 4 d This part is called the fovea. a. (4) b. (5) c. (6) d. (7) 7. There are no rods or cones at this part of the eye. It is a blind spot. a. (5) b. (6) c. (7) 1
2 8. When light travels from a vacuum to a medium it, necessarily, does which of these? a. travels straight b. slows down c. bends d. speeds up 9. What is the proper order of these types of radiation, in order from smallest to biggest energy? gamma rays infrared microwaves ultraviolet a. infrared, microwaves, ultraviolet, gamma rays b. microwaves, infrared, ultraviolet, gamma rays c. infrared, ultraviolet, microwaves, gamma rays d. gamma rays, infrared, microwaves, ultraviolet 10. Visible light is caused by which of these? a. Moving magnetic fields b. Excessive heating of the atom c. Electrons moving in and out of energy states of an atom d. Visible light is always in existence; it is not caused by anything 11. Light moves from glass to water as in this figure. The light. a. bends towards the normal b. bends away from the normal c. travels straight d. reflects off of the water 12. Light moves through a slab of glass. Which is the path it would take? a. a b. b c. c 13. The focal length is equal to. I. ½ the center of curvature II. The point where parallel rays focus III. The center of curvature a. III b. II & III c. I &II d. I e. II 14. For the eye, when you change the object distance, you must change the to focus the image. a. focal length b. magnification c. image distance d. index of refraction 15. An astigmatism causes. a. Light to be dimmer than usual b. The dispersion of light c. multiple focal points of light d. The light to focus in front of the retina e. The light to focus behind the retina 16. Hyperopia or far-sightedness is usually caused by the. a. eyeball being too long b. eyeball being too short c. the retina not functioning properly d. the lens having multiple focal points 2
3 17. A near-sighted person can see. a. nearby things b. very bright lights c. far away things d. nothing without glasses 18. The near point of a typical person is which of these? a. 200 cm b. 0.2 cm c cm d. 20 cm 19. As you age, your nearpoint. a. goes away b. increases c. decreases 20. The focal length of the lens in your eye is equal to the diameter of the eyeball when the object is. a. nearby b. far away c. real d. virtual 21. Light entering the eye refracts the most at which point? a. the fovea b. the aqueous humor c. the lens d. the cornea 22. This liquid in your eye is the same as when you were born. It is not replenished nor does it drain. a. aqueous humor b. vitreous humor c. CSF d. fovea 23. What is the primary purpose of the aqueous humor? a. to refract light b. to help maintain the spherical shape of the eyeball c. to limit the amount of light entering the eye d. to provide nutrients to the eye 24. To correct your vision, the optometrist prescribes convex lenses with a strength of 2 diopters. At what point do these lens focus light? a. 1.5 m b. 0.5 m c. 2 m d m 25. Concave lenses cause light rays to. a. travel faster b. diverge c. converge d. create a real image 26. Light can be described by which of these quantities? I. Frequency II. Wavelength III. Amplitude a. I & II b. II & III c. I & III d. II e. All of these 27. Which of these electromagnetic waves has the highest energy? a. blue light b. gamma-rays c. radio waves d. ultraviolet light 28. As light moves from air to glass, the speed of the light. a. increases b. decreases c. stays the same 29. When light travels from air to water, the angle of refraction will be the angle of incidence. a. greater than b. less than c. same as 3
4 30. A convex lens is shown. Is this a converging or diverging lens? 35. What type of lens is this? a. converging b. diverging c. neither 31. Which of these is the sensory layer of the eye? a. vitreous humor b. cornea c. iris d. retina 32. A person diagnosed with nearsightedness or myopia. a. cannot see distant objects b. cannot distinguish colors c. cannot focus at all d. cannot see nearby objects 33. Presbyopia is a condition of farsightedness that occurs because of. a. a torn optic nerve. b. a cloudy cornea c. an eyeball that is elongated d. old age 34. The following diagram shows a nearsighted eye. What type of lens is used to correct the person s vision? a. concave lens b. convex lens c. This can only be corrected by surgery d. There is no hope. a. convex & converging b. convex & diverging c. concave & converging d. concave & diverging 36. Which of these colors of light carries the most energy? a. green b. blue c. red d. yellow 37. The law of refraction describes how light s varies. a. speed b. color c. amplitude d. frequency 38. Far-sightedness usually occurs because the eyeball is. a. too short b. too round c. too long d. asymmetrically shaped 39. At night, which of these parts of the eye is activated? a. rods b. cones c. the rods and cones always function the same. 40. Electromagnetic radiation is caused by a. moving charges b. radioactive elements c. a constant magnetic field d. electricity 4
5 ID: A Exam 3--PHYS 151--S15 Answer Section MULTIPLE CHOICE 1. ANS: A PTS: 1 2. ANS: B PTS: 1 3. ANS: B PTS: 1 4. ANS: D PTS: 1 5. ANS: A PTS: 1 6. ANS: D PTS: 1 7. ANS: B PTS: 1 8. ANS: B PTS: 1 9. ANS: B PTS: ANS: C PTS: ANS: B PTS: ANS: A PTS: ANS: C PTS: ANS: A PTS: ANS: C PTS: ANS: B PTS: ANS: A PTS: ANS: D PTS: ANS: B PTS: ANS: B PTS: ANS: D PTS: ANS: B PTS: ANS: D PTS: ANS: B PTS: ANS: B PTS: ANS: E PTS: ANS: B PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: D PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: D PTS: 1 REF: S ANS: A PTS: ANS: D PTS: ANS: B PTS: ANS: A PTS: ANS: A PTS: ANS: A PTS: 1 1
6 ID: A 40. ANS: A PTS: 1 2
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