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A narrow beam of unpolarised light of in...

A narrow beam of unpolarised light of intensity `I_(0)` is incident on a polaroid `P_(1)`. The light transmitted by it is then incident on a second polaroid `P_(2)` with its pass axis making an angle of `60^(@)` to the pass axis of `P_(1)`. Find intensity of light transmitted by `P_(2)`.

Text Solution

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According to Malus' Law
`I=I_(0)cos^(2) theta`
`I=((I_(0))/2)cos^(2) theta` where `I_(0)` is the intensity of unpolarized light.
`theta=60^(@)C` (given)
`I=(I_(0))/2cos^(2) 60^(@)=1/2=(I_(0))/2xx(1/2)^(2)=(I_(0))/8`
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