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The refractive index of a liquid is 1.5. If the velocity ...

The refractive index of a liquid is 1.5. If the velocity of light in vacuum is 3.0 x 108ms1, the velocity of light in the liquid is 

A.

1.5 x 108ms1

B.

2.0 x 108ms1

C.

3.0 x 108ms1

D.

4.5 x 108ms1

Correct answer is B

n = speed in airspeed in glass 

1.5 = 3×104speed in glass

Speed in glass = 3 x 108m/s / 1.5

= 2 x 108m/s