Question

A ray of light retraces its path after reflection in case of normal incidence

Answer 1

For a ray incident normally on a mirror, the ray falls along the normal to mirror. Therefore, angle of incidence, i=00. As angle of reflection (r)= angle of incidence =00, therefore, reflected ray goes along the normal. Hence, the ray retraces its path.

Answer 2

Answer:

So the reflected angle becomes 0 and the ray retraces its path through normal.