Question on: JAMB Physics - 2020
The refractive index of a liquid is 1.5. If the velocity of light in a 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\(^8ms^{-1}\)
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Correct Option: B
The refractive index, n = \(\frac{\text{speed in air}}{\text{speed in glass}}\)
1.5 = \(\frac{3 \times 10^4}{\text{speed in glass}}\)
Speed in glass = 1.5 x 3 x 10\(^4\)m/s
= 2 x 10\(^8\)m/s
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