two crossed Polaroid A and B in the path of beam of unpolarised light. in between these two Polaroid, a third Polaroid C is placed such that it's principal section is at an angle of 30 degree with that of A. what percentage of intensity of incident unpolarised light emerges from C and B.
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Answer:37.5%
Explanation: when passing through A it's I/2 (as polorised light become unpolorised)
When passing through c at angle 30degrees
I/2cos(square) theta
I/2cos(square)30
3I/8
%of unpolorised light is 3/8*100=37.5
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