Question

If the reflected ray is at the angle of 90
0
to the incident ray, then what is

the angle of incidence of a ray?

Answer 1

Answer:

45 degrees

Explanation:

According to the laws of reflection,

Angle of incidence = angle of reflection

Or, i = r

Since the incident ray is perpendicular to the reflected ray,

i+r=90

But i=r

So i=45

Angle of incidence is 45 degrees.

Answer 2

Answer:

45 degrees..........