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Refractive Index

The refractiv...

Question

The refractive index of glass is 1.5. What is the speed of light in glass? (Speed of light in vacuum is $3.0 \times 10^{8} m s^{- 1})$

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Solution

We know that refractive index of light is defined by $η = \frac{s p e e d o f l i g h t i n v a c c u m}{s p e e d o f l i g h t t h a t m e d i u m}$
$η = \frac{3 \times 10^{8}}{v} = 1.5$
$v = 2 \times 10^{8} m / s$

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