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Light enters from air to glass having refractive index 1.50. What is thespeed of light in the glass? The speed of light in vacuum is 3 × 108 m s–1.



Refractive index of glass with respect to air = speed of light in air\speed of light in glass

1.5 = 3x10^8\speed of light in glass

speed of light in glass = 1.5\ 3x10^8
                                    = 1\ 2x10^8 m/s
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