The angle of minimum deviation by prism is (180∘−A). Its critical angle will be :
sin−1(cosecA2)
sin−1(cotA2)
cos−1(cotA2)
cos−1(tanA2)
A
sin−1(cosecA2)
B
cos−1(tanA2)
C
sin−1(cotA2)
D
cos−1(cotA2)
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