A light ray is incident perpendicularly ...

A light ray is incident perpendicularly to one face of a `90^circ` prism and is totally internally reflected at the glass-air interface. If the angle of reflection is `45^circ`, we conclude that the refractive index n

`n lt 1/sqrt(2)`

`n gt sqrt(2)`

`n gt 1/sqrt(2)`

`n lt sqrt(2)`

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