1.

Two polaroid sheets are placed one over the other with their axes inclied to each other at an angle `theta` . If only `12.5%` of the intensity of the light incident on the first sheet emerges out from the second sheet, the value of `theta` isA. `30^(@)`B. `60^(@)`C. `45^(@)`D. `90^(@)`

Answer» Correct Answer - B
`I = (I_(0))/(2) cos^(2) theta`
`(I)/(I_(0)) = (1)/(2) cos^(2) theta :. 12.5% = (1)/(2) cos^(2) theta`
`cos^(2) theta = 0.25 = (1)/(4) :. cos theta = 0.25 = (1)/(2)`
`:. theta = 60^(@)`


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