1.

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 isA. `45^(@)`B. `39^(@)`C. `20^(@)`D. `30^(@)`

Answer» Correct Answer - D
(d) Given, `i=e=3/4A=3/4xx60^(@)=45^(@)`
In the position of minimum deviation,
`2i=A+delta_(m)`
or `delta_(m)=2i-A`
`2xx45^(@)-60=30^(@)`


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