If a ray of light is incident on a plane mirror at an angle of `30^(@)` , then deviation produced by the plane mirror is

Options

A. `30^(@)`
B. `60^(@)`
C. `90^(@)`
D. `120^(@)`

Answer

D

Explanation

Given : Angle of incidence (i) `=30^(@)` . We know that angle of reflection (r) = Angle of incidence (i) `= 30^(@)`
We also know that deviation produced by plane mirror
`(delta) = 180^(@) - (i + r)`
`= 180^(@) - (30^(@) + 30^(@))`
`= 180^(@) - 60^(@) = 120^(@)`