Light travels in two media A and B with ...

Light travels in two media A and B with speeds `1.8 × 10^(8) m s^(–1) and2.4 × 10^(8) m s^(–1)` respectively. Then the critical angle between them is

`Sin^(-1)(2/3)`

`tan^(-1)(3/4)`

`tan^(-1)(2/3)`

`Sin^(-1)(3/4)`

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