Abstract
Abstract“Diffraction integrals and the Kirchhoff approximation” gathers together theorems concerned with diffraction. The diffraction integral may be put into Dirichlet and Neumann forms. Back-diffraction is exactly zero (not relying on a Kirchhoff approximation or an obliquity factor). We discuss the limits on Kirchhoff's approximation, complementary apertures (Babinet's principle), the Fraunhofer limit, and the case of a long slit.
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