Refractive index

$A ray of light being refracted in a plastic block.$

$Refraction of a light ray.$

$Thomas Young coined the term index of refraction.$

$Diamonds have a very high refractive index of 2.42.$

In optics, the refractive index or index of refraction n of a material is a dimensionless number that describes how light propagates through that medium. It is defined as

where c is the speed of light in vacuum and v is the phase velocity of light in the medium. For example, the refractive index of water is 1.333, meaning that light travels 1.333 times faster in a vacuum than it does in water.

单词	Absolute refractive index
释义	Absolute refractive index 英语百科 Refractive index $A ray of light being refracted in a plastic block.$ $Refraction of a light ray.$ $Thomas Young coined the term index of refraction.$ $Diamonds have a very high refractive index of 2.42.$ In optics, the refractive index or index of refraction n of a material is a dimensionless number that describes how light propagates through that medium. It is defined as where c is the speed of light in vacuum and v is the phase velocity of light in the medium. For example, the refractive index of water is 1.333, meaning that light travels 1.333 times faster in a vacuum than it does in water.
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Absolute refractive index

Refractive index