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JAMB Physics 2020 Paper

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Question : 24

Total: 38

The refractive index of a liquid is 1.5. If the velocity of light in vacuum is 3.0 x 10

{}^8\text{m/s}

, the velocity of light in the liquid is

1.5 x 10 ${}^8\text{m/s}$
2.0 x 10 ${}^8\text{m/s}$
3.0 x 10 ${}^8\text{m/s}$
4.5 x 10 ${}^8\text{m/s}$

Solution:

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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