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Question: 

Two Polaroids are aligned so that the initially unpolarized light passing through them is a maximum. At what angle should one of them be placed so the transmitted intensity is subsequently reduced by half?

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 

$45^\circ$

Giancoli 7th Edition, Chapter 24, Problem 66

(1:20)

Chapter 24, Problem 66 is solved.

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