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Help with polarization and half-wave plates

  • Thread starter benoy
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I am taking a course in Electro-Optics for Electrical Engineering and I am having some problem solving the following question.

Take two ideal polarizers (the first with its axis vertical and the second, horizontal) and insert between them a stack of 10 half-wave plates, the first with its fast axis rotated pi/20 rad. from the vertical, and each subsequent one rotated pi/20 rad. from the previous one. Determine the ratio of intensity after the second polarizer to that after the first polarizer.

Does anyone know how to solve this problem?
 

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