Question

a light ray strikes a surface such that angle of deviation is twice the angle of incidence. The angle of reflection is??
options :-
a) 45
b) 90
c) 0
d) 180

Answer 1

Answer:

Angle of deviation is = 2* the glance angle. It is a law that the incident angle is = to the angle of reflection. The perpendicular normal will have an angle of 90 degrees. we know that incident angle is = to the angle of reflection so reflection angle = 30 degrees so the glance angle is 90–30=60 degrees.Angle of deviation is = 2* the glance angle so 2*60 = 120 degrees.

Hence delta= 120 degrees