What will happen to the reflected ray, if the incident ray falls along the normal to the mirror?

It will take the path A.

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It will take the path C.

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It will take the path B.

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It retraces back.

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Solution

The correct option is D
It retraces back.

If the incident ray falls along the normal, the ray reflects back without any deviation.
The angle of reflection is calculated with respect to normal, so if the ray falls along the normal, then angle of reflection = angle of incidence = 0 degrees.

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