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A ray of light incident on a glass spher...

A ray of light incident on a glass sphere (refractive index `sqrt(3)` ) suffers total internal reflection before emerging out exactly parallel to the incident ray. The angle of incidence was

A

`75^(@)`

B

`30^(@)`

C

`45^(@)`

D

`60^(@)`

Text Solution

Verified by Experts

The correct Answer is:
D
`anglei = 2 angler `
`(sini)/(sin r) = sqrt(3)`
2 cos r = `sqrt(3)`
r = `30^(@) " and " i = 60^(@)`
Note : But for r = `30^(@)` TIR cannot take place at B.
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