Two transparent media A and B are separated by a plane boundary. The speed of light in medium A is `2.0xx10^(8)ms^(-1)` and in medium B is `2.5xx10^(8)ms^(-1)`. The critical angle for which a ray of light going from A to B suffers total internal reflection is

The speed of light in vacuum is 3 xx 10^8 ms^(-1)

The speed of light in medium A is 2.0xx10^8m//sec and that in medium B is 2.4xx10^8m//sec . The critical angle of incidence for light tending to go from medium A to medium B is

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?