Question

Why does a day if light falling normally on a plane mirror retraced it's path on reflection

Answer 1

Because angle of incidence is always equal to the angle of reflection. And as the ray is falling normally, it retraces it's path.

Answer 2

Answer:

angle of reflaction is equal to the incident ray

Explanation:

there is a law which tells us that angle of incident is equal to the incident so,when the light coming at the angle of 90 then it will not change it direction and reflact back on its own path

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