If a Ray of light falls perpendicularly on a smooth surface it A) goes away from normal B) goes towards normal C) retraces its path
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According to the laws of reflection angle of incidence will always be equal to angle of reflection ( when light is striking a plane mirror ). Angle of incidence is the angle made by incident light ray with the normal. Normal is defined as the perpendicular drawn to surface of plane mirror which is in the same plane as that of incident and the reflected ray.
If light falls perpendicular to the surface of mirror, that is the angle of incidence is zero degrees then the angle of reflection is also zero. Hence the light ray will retrace its path
The correct answer is (C):
Smooth surface means plane mirror.
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