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Two transparent media A and B are separa...

Two transparent media A and B are separated by a plane boundary. The speed of light in those media are `1.5 xx 10^8 m/s` and `2.0 xx 10^8 m/s` respectively. The critically angle for a ray of light for these two media.

A

`sin^-1 (0.500)`

B

`sin^-1 (0.750)`

C

`tan ^-1 (0.500)`

D

`tan^-1 (0.750)`

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