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Refracting angle o f a prism A=60^@ and ...

Refracting angle o f a prism `A=60^@` and its refractive index is `n=3//2`. What is angle of incidence i to get minimum deviation. Also, find the minimum deviation. Assume the surrounding medium to be air `(n=1)`.

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The correct Answer is:
`sin^(-1) ((3)/(4)), 2 sin^(-1) ((3)/(4)) -(pi)/(3)`
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