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

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Fraunhofer Diffraction--Double Slit

For two slits of width separated by a distance , Fraunhofer diffraction gives the wavefunction

where C is a constant, k is the wavenumber, and is the angular distance from the center of the slit. The intensity pattern is then given by

Diffraction Grating, Fraunhofer Diffraction