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Questions  

A ray of light falls on the surface of a spherical paper weight making an angle α  with the normal and is refracted in the medium at an angle β .  The angle of deviation of the emergent ray from the direction of the incident ray is

a
α-β
b
2α-β
c
α-β2
d
β-α

detailed solution

Correct option is B

Sum of the interior angle = exterior angletotal deviation=α-β+α-β=2α-β

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