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An equilateral prism deviates a ray thro...

An equilateral prism deviates a ray through `45^(@)` for the two angles of incidence differing by `20^(@)`. The angle of incidence is

A

`30^(@)`

B

`50^(@)`

C

`20^(@)`

D

`60^(@)`

Text Solution

Verified by Experts

The correct Answer is:
D
`1+e-A=40^(@)`
`i+e=100^(@) (A=60^(@))`
different between I and e is `20^(@)`
So, I and e may be `40^(@)` and `60^(@)`
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