Question

An incident ray strikes a plane mirror angle 20 degree with plane mirror. Find the angle between reflected ray and incident ray?

Answer 1

Step-by-step explanation:

According to laws of reflection :

Angle i = angle r

Angle i = 20

So angle r = 20

Answer 2

Angle of incident ray with the plane mirror = 20°

Angle of incidence (i)= 90° -20° = 70°

Angle of reflection (r) = 70°

Angle between incident and reflected ray = i + r = 70° + 70° = 140°