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Unformatted text preview: Dr. Huerta Phy 102 KEY Test 3 Form 1 11 April 2005 Spring Semester 2005, Sections S and T THIS IS THE KEY FOR FORM ONE (1) CORRECT ANSWERS ARE MARKED [X] EACH MULTIPLE CHOICE QUESTION IS WORTH 5 POINTS. Physics 102 Test 3 KEY Form 1 11 April 2005 Dr. Huerta Phy 102 KEY Test 3 Form 1 11 April 2005 [1.] Light with frequency f 1 and wavelength 1 traveling in a medium with index of refraction n 1 enters a medium with index of refraction n 2 . The frequency f 2 and wavelength 2 are [A] f 2 = n 1 n 2 f 1 , 2 = n 1 n 2 1 [B] f 2 = f 1 , 2 = n 2 n 1 1 [C] f 2 = n 1 n 2 f 1 , 2 = 1 [D] f 2 = n 2 n 1 f 1 , 2 = 1 [X] f 2 = f 1 , 2 = n 1 n 2 1 [2.] When a lens is forming a real image and a diaphragm is used to cover the outer edge of the lens leaving a hole in the middle of the lens [A] only the outer edge of the image is formed and its center disappears [B] only the center of the image is formed and its outer edge disappears [X] the entire image is formed and it appears dimmer and sharper [D] the entire image is formed and it appears dimmer and blurrier [E] the image is unchanged [3.] A light meter indicates a camera setting of 1/125 s shutter speed at f/ 8. If the photographer prefers to use a faster shutter speed and sets the shutter at 1/500 s, what f/ number is required to obtain correct exposure? The sequence of f/numbers is: f/1.4 f/2 f/2.8 f/4 f/5.6 f/8 f/11 f/16 f/22....
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