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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

A

`nlt(1)/(sqrt(2))`

B

`ngtsqrt(2)`

C

`ngt(1)/(sqrt(2))`

D

`nltsqrt(2)`

Text Solution

Verified by Experts

The correct Answer is:
2
For total internal reflection from glass-air interface, critical angle C must be less than angle.
i.e `Clti`
or`Clt45^(@)`
`"Sin"Clt"sin"45^(@)`
`(1)/(n)lt(1)/(sqrt(2))`
`ngtsqrt(2)`
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