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?
n = \(\frac{\text{c}}{\text{v}}\)
1.5 = \(\frac{3 \times 10^8}{v}\) v = 2.0 x 108ms-1
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