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Question: For a prism, its refractive index is cot A/2. Then minimum angle of deviation is –...

For a prism, its refractive index is cot A/2. Then minimum angle of deviation is –

A

180 – A

B

1800 – 2A

C

900 – A

D

A2

Answer

1800 – 2A

Explanation

Solution

Cot A/2 =

=

sin (90 – A/2) = sin

so dm = 1800 – 2A