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Critical angle of prism is 40^@. Its pri...

Critical angle of prism is `40^@`. Its prism angle should be ...... to get raywith minimum deviation.

A

`40^@`

B

`60^@`

C

`80^@`

D

`90^@`

Text Solution

Verified by Experts

The correct Answer is:
C
For minimum deviation `r_1 = r_2 = r`
and for prism A = `r_1 + r_2`
``A=2r
Here `r = 40^@` given as critical angle.
`therefore` Prism angle `A=2xx40=80^@`
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