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:

`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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