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Unpolarized light of intensity Io passes through two linear polarizers. When the light emerges from the...

Unpolarized light of intensity Io passes through two linear polarizers. When the light emerges from the second polarizers, its intensity is 5/16 Io. What is the relative angles theta between the transmission axes of the first and second polarizers

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Answer #1

The unpolarized light has all possible directions of vibration. By Malus' law the intensity of light after passing through first polarizer is,

Considering all possible values of , value of  , i.e. average value of is 0.5.

Hence intensity of final transmitted light,

Therefore,

or,

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