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A ray of light passes through an equilat...

A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to `3//4` of the angle of the prism. The angle of deviation is

A

`45^(@)`

B

`39^(@)`

C

`30^(@)`

D

`20^(@)`

Text Solution

Verified by Experts

The correct Answer is:
C
For an equilateral prism `A = 60^(@)` and `i+ e = A + delta therefore delta = i+ e - A`
But `i= e = (3)/(4) (60^(@)) = 45^(@)`
`therefore delta = 45^(@) + 45^(@) - 60^(@) = 30^(@)`
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