The angle of incidence i and refraction r are equal in a transparent slab when the value of i is

The angle of incidence i and refraction r are equal in a transparent slab when the value of i is

Q. The angle of incidence i and refraction r are equal in a transparent slab when the value of i is

A.            0°

B.            45°

C.            90°

D.            depend on the material of the slab

Answer: 0°

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