why refractive index of any medium is more than 1 respect to air?
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______&________.
The speed of light in a vacuum (“space”) is c (299,792,458 m/s). Light, or anything else, can’t go faster than that and so its refractive index is 1. Air’s refractive index is close to 1, in a lot of ways close enough to ignore - especially if you consider c to be 300,000 km/s.
Any medium that affects the speed of light will only slow it down - there’s no “faster” than c, or lower than 1.
Therefore, the refractive index will increase as the speed drops.
_____&______.
______&________.
The speed of light in a vacuum (“space”) is c (299,792,458 m/s). Light, or anything else, can’t go faster than that and so its refractive index is 1. Air’s refractive index is close to 1, in a lot of ways close enough to ignore - especially if you consider c to be 300,000 km/s.
Any medium that affects the speed of light will only slow it down - there’s no “faster” than c, or lower than 1.
Therefore, the refractive index will increase as the speed drops.
_____&______.
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