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Refractive index of prism is sqrt2. One ...

Refractive index of prism is `sqrt2`. One of surface of the prism is polished. If incidence angle is ......, then the ray will be reflected back. (Refraction angle is `30^@`)

A

`0^@`

B

`30^@`

C

`45^@`

D

`60^@`

Text Solution

Verified by Experts

The correct Answer is:
C, D

Using Snell.s law at Q,n`=(sini)/(sinr)`
`thereforesini=nsinr`
`=sqrt2xxsin 30^@`
`=sqrt2xx1/2=(1)/(sqrt2)`
`thereforei=45^@`
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