1.

When a glass prism of refractive angle 60^(@) immersed in a liquid, its angle of minimum deviation (delta_(m)) = 30^(@). The critical angle of glass w.r.t liquid medium is :

Answer»

`45^(@)`
`42^(@)`
`50^(@)`
`52^(@)`

Solution :(a) `mu=(SIN""((1)/(2)(A+delta_(m))))/(sin""(A)/(2))`
`=(sin(60^(@)+30^(@))/(2))/(sin60^(@)/(@))=(sin45^(@))/(SIN30^(@))=sqrt(2)`
`sin C = (1)/(sqrt(2)) rArr C = sqrt(2)`


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