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

A ray of light is incident on the face AB of a glass prism ABC having vertex anlge A equal to `30^(@)`. The face AC is silvered and a ray of light incident on the face AB retraces its path. If the refractive index of the material of prism is `sqrt(3)` find the angle of incidence on the face AB.

`60^@`

`30^@`

`45^@`

`25^@`

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