Question

6.
If an incident ray making an angle of 10° with the horizontal is to be reflected
perpendicular to the horizontal, by an inclined plane mirror, then inclination of the
plane mirror (0) should be​

Answer 1

ANSWER IS 40°

Angle between incident and reflected ray=80

Angle of incidence =Angle of reflected ray=40

Angle of reflected ray with mirror =90−40=50

So angle with horizontal =90−50=40