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Refractive index of a prism is root2. On...

Refractive index of a prism is `root_2`. One side of prism is polished, if ray incidences at ......, then it will return back to its original path, refraction angle is `30^@`

A

`0^@`

B

`30^@`

C

`45^@`

D

`60^@`

Text Solution

Verified by Experts

The correct Answer is:
C, D
From Snell.s law at Q, `n= ( sini)/(sinr)`
`therefore sini=nsin r`
`=sqrt2xxsin 30^@`
`=sqrt2xx1/2=(1)/(sqrt2)`
`therefore i=45^@`
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