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Explanation:
Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water and 200,000 kilometers per second in glass. Speed of light is the lowest in glass.
The refractive index of a medium for light is given by the relation n = c/v where v is the speed of light through a vacuum. For glass, it will be 1.5 and hence, the speed of light in glass will be minimum i.e., 200 000 km/s as compared to 400 000 km/s in a vacuum. So, it will take more time for light to travel through glass.