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If the angle of a prism is 60° and angle...

If the angle of a prism is 60° and angle of minimum deviation is 40°, then the angle of refraction will be ....

A

`4^@`

B

`30^@`

C

`20^@`

D

`3^@`

Text Solution

Verified by Experts

The correct Answer is:
B, C
For minimum deviation, `r_1 = r_2 = r` and prism angle
`A=r_1+r_2=r+r=2r`
`therefore r=A/2=(60^@)/(2)=30^@`
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