A ray of monochromatic light is incident...

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

`0^@`

`30^@`

`45^@`

`60^@`

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