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
n = \(\frac{\text{velocity of light in vacuum}}{\text{velocity of light in liquid}}\)
1.5 = \(\frac{3\times10^4}{\text{velocity of light in liquid}}\)
Velocity of light in liquid = 2 x \(10^8ms^{-1}\)
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