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If the critical angle for total internal...

If the critical angle for total internal reflection from a medium to vacuum is `30^(@)`, the velocity of light in the medium is

A

`3 xx 10 ^8 m//s`

B

`1.5 xx 10^8 m//s`

C

`6 xx 10^8 m//s`

D

`sqrt3 xx 10^8 m//s`

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