A ray of light falls on a plane mirror. When the mirror is turned, about an axis at right angle to the plane of the mirror through `20^(@)`, the angle between the incident ray and new reflected ray is `45^(@)`. Find the angle between the incident ray and original reflected ray.A. `15^(@)`B. `30^(@)`C. `45^(@)`D. `60^(@)`

A ray of light falls on a plane mirror. When the mirror is turned, abo

1.	A ray of light falls on a plane mirror. When the mirror is turned, about an axis at right angle to the plane of the mirror through `20^(@)`, the angle between the incident ray and new reflected ray is `45^(@)`. Find the angle between the incident ray and original reflected ray.A. `15^(@)`B. `30^(@)`C. `45^(@)`D. `60^(@)`
Answer» (c) When mirror is rotated through an angle `theta` about an axis is the place of mirror, then reflected ray is rotated through an angle `2theta`. When mirror is rotated about an axis perpendicular to the plane of mirror. The angle of incidence and angle of reflection does not change.

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