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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

`3xx10^(8)` m/s

B

`1.5xx10^(8)` m/s

C

`6xx10^(8)` m/s

D

`sqrt3xx10^(8)` m/s

Text Solution

Verified by Experts

The correct Answer is:
B
`""_(a)mu_(m)=1/(sinC)=1/(sin30^(@))=2/1`
`implies("Velocity in vacuum")/("Velocity in medium")=2/1`
`"Velocity in medium"=("Velocity in vacuum")/(2)`
`(3xx10^(8))/(2)="Velocity of light in medium"`
`1.5xx10^(8) m//s`
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