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If light travels a distance x in 1 t sec in air and 10 x distance in 2 t sec in a medium, the critical angle of the medium will be

1.          2 1 1 tan t t
2.          2 1 1 sin t t
3.          2 1 1 10 sin t t
4.          2 1 1 10 tan t t

Correct answer:          2 1 1 10 sin t t

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