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The refractive index of water is 4//3. D...

The refractive index of water is `4//3`. Determine the angle of the cone within which the entire outside view will be confined for a fish under water.

A

`35.5 ^(@)`

B

`40^(@)`

C

`43.5^(@)`

D

`48.6 ^(@)`

Text Solution

Verified by Experts

The correct Answer is:
D
For the fish under water , the outside world is restricted to the cone with semivertical angle
`= (theta)/(2) = i_(c)` (where `i_(c)` is the critical angle )

but `sini_(c) = (1)/(mu) = (1)/(4//3) = (3)/(4) = 0.75`
`therefore i_(c) = sin^(-1) (0.75) = 48.6^(@)`
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