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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^(@)`, then velocity of light in the medium is

A

`1.5xx10^(8)m//s`

B

`2xx10^(8)m//s`

C

`3xx10^(8)m//s`

D

`6xx10^(8)m//s`

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