Question

what is a angle if reflection of a ray of light falling on a plane mirror retraces the path
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Answer 1

Answer:

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.

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Answer 2

Answer:

A ray of light falling normally on a plane mirror retraces its path on reflection. Solution : For a ray incident normally on a mirror, the ray falls along the normal to mirror. Therefore, angle of incidence, i=00.