JAMB - Physics (1992 - No. 25) | ExamPlay

JAMB - Physics (1992 - No. 25)

The speed of light in air is 3 x 10\(^8\)ms\(^{-1}\). What is the speed in glass with a refractive index of 1.50?

1.5 x 10⁸ms^-1

3.0 x 10⁸ms^-1

2.0 x 10⁸ms^-1

6.0 x 10⁸ms^-1

Explanation

n = \(\frac{\text{c}}{\text{v}}\)

1.5 = \(\frac{3 \times 10^8}{v}\)

v = 2.0 x 108ms-1

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