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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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This note was uploaded on 05/20/2011 for the course PHYS 2102 taught by Professor Gimmnaco during the Fall '08 term at LSU.
 Fall '08
 GIMMNACO
 Physics

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