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An equilateral prism is kept in the mini...

An equilateral prism is kept in the minimum deviation position. If the angle of incidence of a monochromatic ray at a refracting face is `49^@30`, the angle of minimum deviation of the ray will be

A

`39^@`

B

`49^@ 30^@`

C

`40^@ 30^@`

D

`51^@`.

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