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Two nicol prisms are oriented with their...

Two nicol prisms are oriented with their principal planes making an angle of `60^(@)`. Then ..... % of incident unpolarised light which will pass through the system.

A

50

B

100

C

`37.5`

D

`12.5`

Text Solution

Verified by Experts

The correct Answer is:
D
The intensity of emerging light from first nicol prism,
`I_(1)=(I_(0))/(2)`
The intensity of emerging light from second nicol prism
`I_(2)=I_(1) cos^(2) theta`
`=(I_(0))/(2)xx cos^(2)60^(@)`
`=(I_(0))/(8) " " [ :. cos60^(@)=(1)/(2]`
`=(I_(0))/(8)xx100%xx (10)/(I_(0))=12.5%`
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