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how to calculate the speed of light in different mediums. For example typical soda-lime glass has a refractive index of 15 which means that in glass light travels at times the speed of light in a vacuum. You may already know that light is the fastest entity in the universe and that nothing can travel faster than it.
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It is defined as n cv where c is speed of light in vaccum and v is velocity of light in the material. S c t. Optically dense medium glass a slower medium larger index of refraction.
The refractive index of air for visible light is about 10003 so the speed of light in air is about 90 kms 56 mis slower than c.
For example the speed of sound in air at 0 0 C is 331 m s 1 and at 22 0 C it is 344 m s 1. Optically rare medium air a faster medium smaller index of refraction. Using the definition of n we can find the speed of light through lead. Optically dense medium glass a slower medium larger index of refraction.
