菲涅耳方程 Fresnel equations
（重定向自Fresnel reflection coefficient）
![波的部分的振幅经过由低到高反射率的介质的反射和折射](/Images/godic/202501/14/Partial_transmittance3451.gif")
![菲涅耳方程中所用的变量](/Images/godic/202501/14/Fresnel.svg3451.png")
![](/Images/godic/202501/14/Fresnel23451.png")
菲涅耳方程（或称菲涅耳条件）是由法国物理学家奥古斯丁·菲涅耳推导出的一组光学方程，用于描述光在两种不同折射率的介质中传播时的反射和折射。方程中所描述的反射因此还被称作“菲涅耳反射”。
Fresnel reflection coefficient
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Fresnel equations 菲涅耳方程
（重定向自Fresnel reflection coefficient）
![At near-horizontal incidence, media interfaces can be mirror-like, despite being poor reflectors at θi = 0](/Images/godic/202501/14/Hospital_corridor_23451.jpg")
_23451.jpg")
![Variables used in the Fresnel equations](/Images/godic/202501/14/Fresnel1.svg3451.png")
The Fresnel equations (or Fresnel conditions), deduced by Augustin-Jean Fresnel (/freɪˈnɛl/), describe the behaviour of light when moving between media of differing refractive indices. The reflection of light that the equations predict is known as Fresnel reflection.
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