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प्रश्न
A ray is incident on a plane mirror . Its reflected ray is perpandicular to the incident ray . Find the angle of incidence .
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उत्तर
Angle of incidence (i) + Angle of reflection(r) = 90o
But, as per the laws of reflection, i = r
Therefore, 2 i = 90o
Or, i = r = 45o
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