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14/09/2021 7:19 pm
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Light enters from air to glass having refractive index 1.5. What is the speed of light in the glass? The speed of light in vacuum is 3 x 108 m s-1.
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14/09/2021 7:22 pm
Given: refractive index, μ = 1.5, speed of light in vacuum c = 3 x 108 m s-1 v = ?
Applying the formula μ = \(\frac{c}{v}\), we get
v = \(\frac{c}{\mu}\) = \(\frac{3 \times 10^8}{1.5}\)
= 2 x 108 m s-1
Hence, the speed of light in glass is 2 x 108 m s-1