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For the situations shown in figure, dete...

For the situations shown in figure, determine the angle by which the mirror should be rotated, so that the light ray will retrace its path after refraction through the prism and reflection from the mirror?

A

`1^(@)ACW`

B

`1^(@)CW`

C

`2^(@)ACW`

D

`2^(@)CW`

Text Solution

Verified by Experts

The correct Answer is:
d.
For light to retrace the path, light ray falling on the mirror should be along the normal.
Deviation produced by prism,
`delta_(1)=(1.5-1)4=2^(@)CW`
So, mirror has to be rotated by `2^(@)` in CW direction.
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