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The polarising angle for a medium is 68^...

The polarising angle for a medium is `68^(@)`. What is the critical angle id the ray passes from medium to air ?

A

`30^(@)`

B

`45^(@)`

C

`90^(@)`

D

`60^(@)`

Text Solution

Verified by Experts

The correct Answer is:
B
`I = (I_(0))/(2) cos^(2) theta`
`(I_(0))/(4) = (I_(0))/(2) cos^(2) theta :. cos^(2) theta = (1)/(2)`
`:. theta = 45^(@)`
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