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If the angle of prism is 60^(@) and th...

If the angle of prism is `60^(@)` and the angle of minimum deviation is `40^(@)` , the angle of refraction will be

A

`4^@`

B

`30^@`

C

`20^@`

D

`3^@`

Text Solution

Verified by Experts

The correct Answer is:
B
At minimum deviation
`r_1 = r_2 = r`
`r_1 + r_2 = A`
`r + r = A`
`2r = A`
`r = A/2 = 60/2 = 30^@`
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