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Two transparent media A and B are adjace...

Two transparent media A and B are adjacent to each other. Velocity of light in medium A is `2 xx 10^(8)m * s^(-1)` and in medium B it is `2.5 xx 10^(8)m*s^(-1)`. If ray of light under goes total internal reflection when travelling from A to B then what is the critical angle for the pair of media?

A

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

B

`sin^(-1)(2/5)`

C

`sin^(-1)(5/4)`

D

`sin^(-1)(4/5)`

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