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In a medium speed of light is 1.5 xx 10^...

In a medium speed of light is `1.5 xx 10^8` m/s and in another medium speed of light is `2 xx 10^8` m/s. Find critical angle for given two media.

A

`sin^-1 3/4`

B

`sin^-1 3/5`

C

`sin^-1 1/4`

D

`sin^-1 1/3`

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