A ray of monochromatic light is incident...

A ray of monochromatic light is incident on one refracting face of a prism of angle `75^(@)`. It passes thorugh the prism and is incident on the other face at the critical angle. If the refractive index of the material of the prism is `sqrt(2)`, the angle of incidence on the first face of the prism is

`30^@`

`45^@`

`60^@`

`0^@`

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