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Question: 

Three perfectly polarizing sheets are spaced 2 cm apart and in parallel planes. The transmission axis of the second sheet is $30 ^\circ$ relative to the first one. The transmission axis of the third sheet is $90 ^\circ$ relative to the first one. Unpolarized light impinges on the first polarizing sheet. What percent of this light is transmitted out through the third polarizer?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

9.4%

Giancoli 7th Edition, Chapter 24, Problem 64

(2:30)

Chapter 24, Problem 64 is solved.

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