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Answer to Question #2973 in Optics for varya

Question #2973
Unpolarised light of intensity I falls on a polaroid. The emerging light is passed thru another polaroid whose axis makes an angle of 30 degrees with respect to the first one. What is the intensity of final emergent light?
Expert's answer
By the Malus' law:
I = I0 cos α = I0 cos 30 = I √(3) /2.

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