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pe25f08 - of the combined lens(Power of Lenses a 1/3...

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Last updated: December 4, 2008 PHY 2054 Discussion – Fall ‘08 Practice Exam Problems (Chapter 25) 1. Which term identifies the eye defect where the lens produces a line image of a point source? (Eyes) a. myopia b. presbyopia c. hyperopia d. astigmatism 2. A nearsighted person cannot see objects clearly beyond 30 cm (the far point). If the patient has no astigmatism and contact lenses are prescribed, what is the power of the lens required to correct the patient’s vision? (Corrective Lenses) a. -2.0 diopters b. -3.3 diopters c. -4.0 diopters d. -5.0 diopters 3. A thin lens of focal length 10 cm is placed in contact with a 30-diopter thin lens. What is the power
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Unformatted text preview: of the combined lens? (Power of Lenses) a. 1/3 diopter b. 20 diopters c. 40 diopters d. 300 diopters 4. A lens is used as a magnifier. Which of the following statements is incorrect? (Simple Magnifier) a. The lens is convex. b. The dioptric power of the lens is positive. c. The magnification is greatest when the eye focuses at the near point. d. The focal length of the lens must be negative. 5. A magnifying lens with a focal length of 10 cm has what maximum magnification? (Assume the near point is 25 cm.) (Angular Magnification) a. 7.1 b. 2.5 c. 3.0 d. 3.5 Answers: 1-d 2-b 3-c 4-d 5-d...
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