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A ray of light travelling through air is...

A ray of light travelling through air is incident on the surface of water in a lake . If the ray is inclined at `30^@` with the surface and if the refractive index of water is 4/3 then the angle through which the ray deviates is

A

`30^@ + sin^-1 (3sqrt(3)/8)`

B

`60^@ - sin^-1(3sqrt(3)/8)`

C

`60^@ - sin^-1(3/8)`

D

`30^@ - sin^-1(3/8)`

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