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A horizontal light ray passes through a ...

A horizontal light ray passes through a prism `(mu=1.5)` of angle `4^(@)`.Further, it is incident on a plane mirror `M`, that has been placed verticall. By what angle the mirror is rotated so that the ray after reflection becomes horizontal?

A

`1^(@)`

B

`2^(@)`

C

`4^(@)`

D

`8^(@)`

Text Solution

Verified by Experts

The correct Answer is:
A
`delta=(mu-1)A=2^(@)`
so by rotating mirror by `1^(@)` in clockwise direction, emergent ray after reflection will become horizontal.
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