Question

What is the reason due to which the ray of reflection is equal to the ray of insedence?is some rays of light does not observe by the mirror?

Answer 1

Answer:

the reason why angle of incidence is equal to angle of reflection is light seems to follow this principle called the fermat principle of least time

which states that light always travels through the faster route

using calculus or simple geometry it may be proved that the faster route is one when angle of incidence is equal to angle of reflection

and yes some rays of light are absorbed by the mirror