Fraunhofer Diffraction--Single Slit -- from Eric Weisstein's World of Physics

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Fraunhofer Diffraction--Single Slit

Let the slit have width D, then Fraunhofer diffraction gives the wavefunction

where C is a constant, k is the wavenumber, and

The intensity is then

Airy Pattern, Fraunhofer Diffraction--Circular Aperture, Fraunhofer Diffraction, Fraunhofer Diffraction--Rectangular Aperture