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A prism of apex angle A=60^@ has the ref...

A prism of apex angle `A=60^@` has the refractive index `mu=sqrt2.` The angle of incidence for minimum deviation is

A

`30^@`

B

`45^@`

C

`60^@`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
At minimum deviation,
`r_1=r_2=A/2=30^@`
Now using, `mu=(sini_(1))/(sinr_(1))` or `sqrt2=sini_1/sin30^@`
We get `i_1=45^@`
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