The refractive index of a liquid is 1.5. If the velocity of light in vacuum is 3.0 x 10(^8ms^{-1}), the velocity of light in the liquid is
-
A.
1.5 x 10(^8ms^{-1}) -
B.
2.0 x 10(^8ms^{-1}) -
C.
3.0 x 10(^8ms^{-1}) -
D.
4.5 x 10(^8ms^{-1})
Correct Answer: Option B
Explanation
n = (frac{text{speed in air}}{text{speed in glass}})
1.5 = (frac{3 times 10^4}{text{speed in glass}})
Speed in glass = 3 x 10(^8)m/s / 1.5
= 2 x 10(^8)m/s
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