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Phys214 Fall 2004MidtermForm A6/151. A clear sheet of polaroid is placed on top of a similar sheet so that their polarizing axes make anangle of 30° with each other. The ratio of the intensity of emerging light to incident unpolarizedlight is:A. 1:4B. 1:3C. 1:2D. 3:4E. 3:87/32. A monochromatic light ray that has been traveling through water (n= 1.33) enters air. After theray enters the air, which of the following correctly describes the relative change in the speed,frequency, and wavelength of the ray?A. its speed and wavelength both decrease; its frequency stays the same.B. its speed and wavelength both increase; its frequency stays the same.C. its speed and wavelength both decrease; its frequency increases.D. its speed and wavelength both increase; its frequency decreases.E. its speed stays the same, its wavelength increases, and its frequency decreases.11/73. A 5.0-ft woman wishes to see a full length image of herself in a plane mirror. The minimum lengthmirror required is:14/64. A concave spherical surface with radius r separates a medium with index of refraction 2 from air.As an object is moved toward the surface from far away along the central axis its image:A. changes from virtual to real when it is r/2 from the surface.B. changes from virtual to real when it is 2r from the surface.C. changes from real to virtual when it is r/2 from the surface.D. changes from real to virtual when it is 2r from the surface.E. remains virtual.Page 1
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