Q.

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

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a

α-β

b

2α-β

c

α-β2

d

β-α

answer is 2.

(Detailed Solution Below)

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Detailed Solution

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