Question

Q1 what are the values of angle of incidence and angle of reflection for normal incidence of light on the planemirror Q2 why no refraction of light occurs when light falls perpendicular to the boundary separating 2 media of different refractive index

Answer 1

answer no. 1-both angles are 0

Answer 2

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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°.