Question
Question: The refractive angle of a prism is A and the refractive index is cotA/2. The minimum deviation is-...
The refractive angle of a prism is A and the refractive index is cotA/2. The minimum deviation is-
A
1800 – 3 A
B
1800 + 2A
C
900 – A
D
1800 – 2A
Answer
1800 – 2A
Explanation
Solution
m =
= 
sin
= sin 
\
= 900 –
= 
dm = 1800– 2A
