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Unformatted text preview: Golshani (ag5873) Homework 01 Yao (57045) 1 This printout should have 13 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points The reflecting surfaces of two intersecting flat mirrors are at an angle of 62 , as shown in the figure. A light ray strikes the horizontal mirror at an angle of 49 with respect to the mirrors surface. 62 49 Figure is not drawn to scale. Calculate the angle . Correct answer: 56 . Explanation: Basic Concept: incident = reflected Solution: 1 2 Figure is to scale. The sum of the angles in a triangle is 180 . In the triangle on the left we have angles , 180  1 2 , and 180  2 2 , so 180 = + 180  1 2 + 180  2 2 , or 1 + 2 = 2 . (1) In the triangle on the right we have angles 1 , 2 , and . 180 = 1 + 2 + , so 1 + 2 = 180  . (2) Combining Eq. 1 and 2, we have = 180  2 = 180  2 (62 ) = 56 . As a matter of interest, in the upperhalf of the figure the angles (clockwise) in the triangles from left to right are 41 , 41 , and 98 ; 82 , 28 , and 70 ; 110 , 21 , and 49 ; 131 , 21 , and 28 ; and in the lowerhalf of the figure the angles (counterclockwise) in the triangles from left to right are 21 , 21 , and 138 ; 42 , 28 , and 110 ; 70 , 41 , and 69 ; 111 , 41 , and 28 . 002 10.0 points Consider a light ray which enters from air to a liquid, where the index of refraction of the liquid is given by n = 2. n = 1 n = 2 Air Liquid light ray Denote the wavelength and the frequency in the liquid by and f and those in the air by and f . Choose the correct pair of ratios: Golshani (ag5873) Homework 01 Yao (57045) 2 1. = 2 , f f = 1 2. = 1 2 , f f = 2 3....
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This note was uploaded on 09/27/2010 for the course PHY 58650 taught by Professor Yao during the Fall '10 term at University of Texas at Austin.
 Fall '10
 YAO

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