![]() ![]() The plane of incidence is defined by the incoming radiation's propagation vector and the normal vector of the surface. The incident light is assumed to be a plane wave, which is sufficient to solve any problem since any incident light field can be decomposed into plane waves and polarizations. The equations assume the interface between the media is flat and that the media are homogeneous and isotropic. (The magnetic fields can also be related using similar coefficients.) These ratios are generally complex, describing not only the relative amplitudes but also the phase shifts at the interface. The Fresnel equations give the ratio of the reflected wave's electric field to the incident wave's electric field, and the ratio of the transmitted wave's electric field to the incident wave's electric field, for each of two components of polarization. When light strikes the interface between a medium with refractive index n 1 and a second medium with refractive index n 2, both reflection and refraction of the light may occur. 6.6 Power ratios (reflectivity and transmissivity). ![]() 3 Complex amplitude reflection and transmission coefficients.2 Power (intensity) reflection and transmission coefficients. ![]()
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