Fresnel at normal incidence: r = (n₁−n₂)/(n₁+n₂)

Layer 1 — Physicsin the photonics subtree

Fresnel equations (Fresnel 1823) for a plane wave at a planar interface between two non-magnetic, non-absorbing dielectrics of real refractive indices n₁, n₂. At normal incidence both s- and p-polarisations collapse to the scalar…

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