Question

if the angle made by the incident ray with the surface of a plane mirror is 30⁰, the angle of reflection must be_____
option :-
1) 30⁰
2) 90⁰
3) 60⁰​

Answer 1

Answer:

60°

According to first law of reflection incident and reflected angles are equal. So, reflected angle will be 30 degrees. Reflected angle and angle B together make up the angle between normal and the surface that is 90 degrees. So, Angle b = (90 - reflected angle), which is (90-30) = 60 degree.