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A certain prism is found to produce a mi...

A certain prism is found to produce a minimum deviation of 38° It produces a deviation of `44^@` when the angle of incidence is either `42^@` or `62^@`. What is the angle of incidence when it is undergoing minimum deviation?

A

`49^@`

B

`30^@`

C

`60^@`

D

`40^@`

Text Solution

Verified by Experts

The correct Answer is:
A
`d=I + C-A `
` d= 42^@ +62^@ -A `
`44^@ = 104 -A `
`A=60^@ `
` D-m = 2i -A `
` 98^@ = 2 I - 60^@`
` 98^@ = 2i implies I = 49^@`
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