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A ray of light falls on a plane mirror. ...

A ray of light falls on a plane mirror. When the mirror is turned, about an axis at right angles to the plane of mirror by `20^(@)` the angle between the incident ray and new reflected ray is `45^(@)`. The angle between the incident ray and original reflected ray was therefore.

A

`65^(@)`

B

`20^(@)` or `65^(@)`

C

`25^(@)`

D

`45^(@)`

Text Solution

Verified by Experts

The correct Answer is:
D
If mirror is turned about an axis perpendicular to plane of mirror, then there will be no change in incident angle and reflected angle so angle between incident & reflected rays after rotation will be same as before.
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