1.

The refracting angle of a prism is A and refractive index of the material of prism is `cot(A//2)` . The angle of minimum deviation will beA. `180^@-3A`B. `180^@+2A`C. `90^@-A`D. `180^@-2A`

Answer» Correct Answer - B
`mu=(sin(A+delta_m)/2)/sin(A//2),`
Given, `mu=cot(A/2)`
Solving, we get `sin=180^@-2A`


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