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Question

Two polaroids are placed in the path of an unpolarized beam of light of intensity such that no light is emitted through the second polaroid. If now a third polaroid whose polarization axis makes an angle 30 with polarization axis of the first is placed between these two polaroids, then the intensity of light emerging through the last polaroid will be

A
I016
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B
3I016
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C
I08
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D
3I032
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Solution

The correct option is D 3I032

Intensity through 1st polaroid, I1=I02
Intensity through 2nd polaroid, I2=(I02)cos230=3I08

Intensity through 3rd polaroid, I3=(3I08)cos260I3=3I032

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