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A beam of unpolarised light of intensity...

A beam of unpolarised light of intensity `I_0` is passed through a polaroid and then through another polaroid B which is oriented so that its principal plane makes an angle of `45^circ` relative to that of A. The intensity of the emergent light is

A

`I_(0)`

B

`I_(0)//2`

C

`I_(0)//4`

D

`I_(0)//8`

Text Solution

Verified by Experts

The correct Answer is:
C
Since the incident regent is unporazes after light passes through polaroid `A=(I_(0))/(2)`
After this light passes through B,
`I_("emergent")=I_("in")cos^(2)phi=((I_(0))/(2))cos^(2)45^(@)=(I_(0))/(4)`
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