Light travels through a glass plate of thickness t and having refractive index μ . If c be the velocity of light in vacuum, time taken by the light to travel through this thickness of glass is

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Thickness of glass plate = t Refractive index = μ Velocity of light = c Speed of light = time distance ​ = T t ​ T = speed of light t ​ ​ Speed of light in glass plate v = μ c ​ T = c / μ t ​ = c μ t ​ ​ ( ∵ μ = v c ​ )

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