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Unformatted text preview: Ph 291, Fall 2010 Final Exam Name: (no name, no score!) Multiple Choice Answer Sheet # Answer 1 2 3 4 5 Subtotal /75 1 Ph 291, Fall 2010 Final Exam Name: (no name, no score!) L1 L2 L3 d d object s o1 Figure 1: Optical path configuration 1. [15 pts] Three thin lenses, each with a focal length of 10 inches, are aligned on a common axis (see figure); adjacent lenses are sep- arated by d = 35 inches. Find the position (relative to L3) of the final image of a small object located 20 inches to the left of the first lens. (A) +10 inches (B)- 10 inches (C) +15 inches (D)- 15 inches (E) +30 inches (F)- 30 inches 2. [15 pts] Light of original intensity I passes through two ideal linear polarizing filters. You want to adjust the angle ϕ between their polarizing axes so that the intensity after passing through both polarizers is equal to I / 8. If the original light is unpolarized, what should ϕ be? (A) 0 ◦ (B) 30 ◦ (C) 45 ◦ (D) 60 ◦ (E) 90 ◦ 3. [15 pts] Light of wavelength λ and frequency f passes through a single slit of width a . The di ff raction pattern is observed on a screen a distance x from the slit. Which of the following will decrease the width of the central maximum?...
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