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If refractive index of glass is 1.50 and...

If refractive index of glass is 1.50 and of water is 1.33, then criticle angle is

A

`sin^(-1) (sqrt((8)/(9)))`

B

`sin^(-1) ((8)/(9))`

C

`sin^(-1) ((5)/(7))`

D

`sin^(-1) ((2)/(3))`

Text Solution

Verified by Experts

The correct Answer is:
B
We have to consider `""_(g) n_(w) = (""_(a) n_(w))/(""_(a) n_(g)) = (4 //3)/(3//2) = (8)/(9)`
`therefore ""_(g) n_(w) = sin C = (8)/(9) therefore C = sin^(-1) ((8)/(9))`
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