A ray of light falls on the surface of a...

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

`(alpha - beta)`

`2(alpha - beta)`

`(alpha - beta)//2`

`(beta - alpha)`

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