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A ray of light falling normal to the mir...

A ray of light falling normal to the mirror returns along the same path.Why?

Text Solution

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When a ray is incident along normal to the mirror, then Piano Minor angle of incidence `(i) = 0^(@)`
According to laws of reflection, angle of reflection (r) = angle of incidence `(i) = 0^(@)`
Therefore,-reflected ray will go back along the normal i.e. it retraces its path.
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