The refractive index of the material...

The refractive index of the material of a prism is ` sqrt(2)` and the angle of the prism is `30 ^(@)` . One of the two refracting surfaces of the prism is made a mirror inwards , by silver coating . A beam of monochromatic lighet enetering the prism from the other face will retrace its path ( after reflection from the silvered surface ) if its angle of incidence on the prism is

`30 ^(@) `

`45 ^(@)`

`60 ^(@)`

zero

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