A ray of light is incident at an angle of `30^(@)` with the plane of a plane mirror. Find the angle of reflection.

Options

A. `0^@`
B. `90^@`
C. `30^@`
D. `60^@`

Answer

D

Explanation

consider the situation shown in the figure. Angle made by the incident ray with the pplane of the mirror MM' is
`angleMOA=30^(@)`. Therefore, angle of incidence,

`angleAON=i=angleNOM-angleAOM=90^(@)-30^(@)=60^(@)`
Also, angle of reflection, `angleBON=r=i=60^(@)`