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The angle of minimum deviation by prism is $(180^{\circ} - A)$ . Its critical angle will be :
$s i n^{- 1} (c o s e c \frac{A}{2})$
$s i n^{- 1} (c o t \frac{A}{2})$
$c o s^{- 1} (c o t \frac{A}{2})$
$c o s^{- 1} (t a n \frac{A}{2})$

A

s i n^{- 1} (c o s e c \frac{A}{2})

B

c o s^{- 1} (t a n \frac{A}{2})

C

s i n^{- 1} (c o t \frac{A}{2})

D

c o s^{- 1} (c o t \frac{A}{2})

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