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Problem
Problem
The refractive angle of a prism is
A
A
A
, and the refractive index of the material of the prism is
cot
(
A
/
2
)
\cot(A/2)
cot
(
A
/2
)
. The angle of minimum deviation is a.
180
∘
−
3
A
180^\circ - 3A
18
0
∘
−
3
A
b.
180
∘
+
2
A
180^\circ + 2A
18
0
∘
+
2
A
c.
90
∘
−
A
90^\circ - A
9
0
∘
−
A
d.
180
∘
−
2
A
180^\circ - 2A
18
0
∘
−
2
A
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