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A prism of angle A and refractive index ...

A prism of angle A and refractive index 2 is surrounded by medium of refractive index `sqrt3` . A ray is incident on side PQ at an angle of incidence `i (0leile90^(@))` as shown in the figure-. The refracted ray is then incident on side PR of prism. The minimum angle A of prism for which ray incident on side PQ does not emerge out of prism from side PR (for any value of i) is:

A

`30^(@)`

B

`45^(@)`

C

`60^(@)`

D

`120^(@)`

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