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One of the refracting surfaces of a pris...

One of the refracting surfaces of a prism of angle of `30^(@)` is silvered. A ray of light incident at an angle of `60^(@)` retraces its path. The refractive index of the material of prism is

A

`sqrt(2)`

B

`sqrt(3)`

C

`3//2`

D

2

Text Solution

Verified by Experts

The correct Answer is:
b.
`r_(2)=0^(@)`
`r_(1)=A=30^(@)`
and `i_(1)=60^(@)`
`mu=(sini_(1))/(sinr_(1))=(sin60^(@))/(sin30^(@))=sqrt(3)`
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