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A ray of light is incident on the glass ...

A ray of light is incident on the glass plate at an angle of incidence equal to the Brewsters angle `(theta_b)`. Let `n` be the refractive index of the glass slab. If the grazing angle for the incident ray be `30^@`, then the angle of refraction will be :

A

`30^@`

B

`60^@`

C

`tan^-1 n`

D

`theta_b//2`.

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