= Polarization perpendicular to the plane of incidence
{title2=$\mathbf E\perp\text{plane of incidence}$}
= s-polarization
{c}
{synonym}
For reflection or refraction at a flat isotropic interface, <s-polarization> has its <electric field> perpendicular to the plane containing the incident <wavevector> and interface normal. At an isotropic <dielectric> boundary it is an eigenpolarization of the Fresnel reflection problem. The label is relative to the specified interface, not an absolute direction in space.
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