折射率 Refractive index
（重定向自Complex index of refraction）
某种介质的折射率 n 等于光在真空中的速度 c 跟光在介质中的相速度 v 之比：
![n=\frac{c}{v}](/Images/godic/202501/05/7b78f2dd4ecd813134c0de17086445ee4330.png")
比如水的折射率是1.33，表示光在真空中的传播速度是在水中传播速度的1.33倍。
历史上，折射率最早出现在折射定律中， n1sinθ1= n2sinθ2, 其中，θ1与θ2分别是光在介质界面上的入射角和折射角，两种介质的折射率分别是n1与n2。
Complex index of refraction
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Refractive index 折射率
（重定向自Complex index of refraction）
![A ray of light being refracted in a plastic block.](/Images/godic/202501/05/Refraction_photo4330.png")
![Refraction of a light ray.](/Images/godic/202501/05/Refraction_at_interface.svg4331.png")
4331.jpg")
![Diamonds have a very high refractive index of 2.42.](/Images/godic/202501/05/Brillanten4331.jpg")
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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