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phy2049e3sm09 - 77777 Instructor P Kumar PHY 2049...

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77777 77777 Instructor: P. Kumar PHYSICS DEPARTMENT PHY 2049 Exam III July 20, 2009 Name (print, last first): Signature: On my honor, I have neither given nor received unauthorized aid on this examination. YOUR TEST NUMBER IS THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE. DIRECTIONS (1) Code your test number on your answer sheet (use 76–80 for the 5-digit number) . Code your name on your answer sheet. Darken circles completely (errors can occur if too light) . Code your student number on your answer sheet. (2) Blacken the circle of your intended answer completely, using a number 2 pencil . Do not make any stray marks or the answer sheet may not read properly. (3) The answers are rounded off. Choose the closest to exact. There is no penalty for guessing. Table of constants k = 1 4 π² 0 e = 1 . 6 × 10 - 19 C m e = 9 . 11 × 10 - 31 kg 1. A ray of light from medium a , whose index of refraction is 1.89, enters medium b . The angle of incidence θ a is 50 and the angle of refraction θ b is 60 . What is the index of refraction of medium b ?
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