What are the values of angle of incidence ∠i and angle of reflection ∠r for normal incidence of
light on a plane mirror ?
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When the light ray is incident normally on plane mirror surface it means the angle between mirror surface and light ray is 90°.
This means the angle between incident light ray and normal is 0º which is called angle of incidence.
As angle of incidence is 0° angle of refelection is also 0°. ( By law of reflection of light)
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