The refractive index of liquid is 1.5. If the velocity of light in vacuum is 3.0 x 108ms-1, the velocity of light in the liquid is
-
A.
1.5 x 108m-1 -
B.
2.0 x 108m-1 -
C.
3.0 x 108m-1 -
D.
4.5 x 108m-1 -
E.
9.0 x 108m-1
Correct Answer: Option B
Explanation
n = (frac{text{speed in air}}{text{speed in glass}})
1.5 = (frac{3times10^4}{text{speed in glass}})
speed in glass = 2 x 108ms-1