sp07final

sp07final - Name: _______________________...

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Unformatted text preview: Name: _______________________ Instructor:__________________ Louisiana State University Physics 2102, Final Exam, May 10, 2007. Please be sure to write your name and class instructor above. The test consists of 7 questions (multiple choice, no partial credit), and 7 problems (numerical). For the problems: Show your reasoning and your work. Note that in many of the problems, you can do parts (b) and (c) even if you get stuck on (a) or (b). You may use scientific or graphing calculators, but you must derive and explain your answer fully on paper so we can grade your work. Feel free to detach, use, and keep the formula sheet pages. No other reference material is allowed during the exam. Good Luck! Question 1 [10 points] The figure shows a linearly polarized electromagnetic wave which is sent through two polarizers. The first polarizer, A , is oriented so that its transmission axis makes an angle of 30 with respect to the incident electric field of the wave. The second polarizer, B , is oriented so that its transmission axis makes an angle of 90 with the incident electric field of the wave. The incident beam has an electric field of peak magnitude E and average intensity I . (i) (5 pts) What is the peak value of the electric field amplitude after it goes through polarizer A ? (Circle the correct answer) Zero 0.30 E 0.60 E 0.75 E 0.87 E (ii) (5 pts) Suppose that A and B are interchanged so that the wave is first incident upon polarizer B . What is the average wave intensity after passing through both polarizing sheets? Zero 0.34 I 0.43 I 0.50 I 0.19 I Question 1 [10 points] The figure shows a linearly polarized electromagnetic wave which is sent through two polarizers. The first polarizer, A , is oriented so that its transmission axis makes an angle of 30 with respect to the incident electric field of the wave. The second polarizer, B , is oriented so that its transmission axis makes an angle of 90 with the incident electric field of the wave. The incident beam has an electric field of peak magnitude E and average intensity I . (i) (5 pts) What is the peak value of the electric field amplitude after it goes through polarizer A ? (Circle the correct answer) Zero 0.30 E 0.60 E 0.75 E 0.87 E (ii) (5 pts) Suppose that A and B are interchanged so that the wave is first incident upon polarizer B . What is the average wave intensity after passing through both polarizing sheets? Zero 0.34 I 0.43 I 0.50 I 0.19 I Problem 1 [18 points] The figure shows the path of a ray of light as it travels through air and crosses a boundary into water. The index of refraction of water for this light is 1.33....
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sp07final - Name: _______________________...

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