Question

a light ray is reflected on a plane mirror at 30° .what would be the angle between reflected ray and incidence ray

Answer 1

Hii frnd.
The angle between the refracted ray and incident ray would be 60 degree.
As the refracted ray make the same angle with the normal which the incident ray make.
So,
As incident ray make 30 degree with normal refracted ray will also make 30 degree with normal.
Hence,
30+30=60 Degree
Hope it helped u.

Answer 2

Now angle of reflection=30°
so, angle of incidence=30°
The angle between reflected ray and incidence ray=angle of reflection+angle of incidence
The angle between reflected ray and incidence ray=30°+30°=60°
HOPE IT WAS HELPFUL