Question

A ray incident normally on a plane mirror retraces its path on reflection. Why?

Answer 1

Dear Student,
SOLUTION:

The angle of reflection is equal to the angle of incidence. If a ray has normal incidence, it is coming straight at the surface and will reflect straight back. Thus the reflected wave traces the exact path as the incident wave.

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Answer 2

Heya buddy..!

Q) A ray incident normally on a plane mirror retraces its path on reflection.
R) We know that if a ray incident on a plane mirror reflects away from it, then the the angle between the incident Ray and normal (angle of reflection) will be equal to the angle between the reflected Ray and the normal. Here a ray is incident NORMALLY on the mirror. This means that the incident Ray and the normal are coincident I.e.,the angle of incidence is equal to zero, thus the angle of reflection also will be zero. So the Ray will be reflected back in the same path.

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