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The velocity of light in vacuum is 3 xx ...

The velocity of light in vacuum is `3 xx 10^8 m//s`. The velocity of light in a medium of refractive index 1.5 is

A

`4.5 xx 10^8 m s^-1`

B

`3 xx 10^8 m s^-1`

C

`2 xx 10^8 m s^-1`

D

`1.5 xx 10^8 m s^-1`.

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