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

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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
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Correct Answer - 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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