Midterm2solutions

# Midterm2solutions - Physics 1C Summer 2011(Session 1...

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Physics 1C, Summer 2011 (Session 1) Midterm 2 (50+4 points) Solutions Problem 1 (5x2 = 10 points) Label the following statements as True or False, with a one- or two-sentence explanation for why you chose your answer. Even if you get the answer correct, you will receive no credit unless your explanation is clear. a. When light travels from air into water, its frequency remains unchanged. b. A lens with a refractive power of 4 diopters has a shorter focal length than a lens with a refractive power of 2 diopters. c. A lens can produce an upright, magnified image on the same side from the lens as the object. d. When unpolarized light passes through a polarizer, the intensity of transmitted light depends on the orientation of the transmission axis of the polarizer. e. When looking at an interference pattern due to two slits, the bright spots increase in distance from each other as the frequency of light incident on the slits increases. Solution a. True: frequency refers to the number of wave peaks (or crests, or whatever unique part of a wave during one wavelength) that go through a point in one second. This does not change as light passes through an interface: it is the wavelength that changes when the speed of light in the different media are different. b. True: The 4 diopter lens has a focal length 0.25 meters, and the 2 diopter lens has a focal length of 0.50 meters. c. True: This can happen for an object placed within the focal length of a converging

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Midterm2solutions - Physics 1C Summer 2011(Session 1...

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