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The speed of light in air is 3 x 108ms-1

The speed of light in air is 3 x 108ms-1. What is the speed in glass with a refractive index of 1.50?

A.

1.5 x 108ms-1

B.

3.0 x 108ms-1

C.

2.0 x 108ms-1

D.

6.0 x 108ms-1

View answer & explanation

Correct answer is C

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

v = 2.0 x 108ms-1

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