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Two transparent media A and B are separated by a plane boundary. The speed of light in medium A is 2.0 × 10^8 ms^-1 and in medium B is 2.5 × 10^8 ms^-1. The critical angle for which a ray of light going from A to B suffers total internal reflection is
(1) sin ^-1 1 / 2
(2) sin ^-1 2 / 5
(3) sin ^-1 4 / 5
(4) sin ^-1 3 / 4

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