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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)cos260∘⇒I3=3I032

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