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Speedof light in vaccum /speedof light in medium

Answer»

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 (refractive index of 1.3; SEE Figure 2) and 200,000 kilometers per second in glass (refractive index of 1.5).



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