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Fresnel numberThe Fresnel number F, named after the physicist Augustin-Jean Fresnel, is a dimensionless number occurring in optics, in particular in diffraction theory. Additional recommended knowledgeFor an electromagnetic wave passing through an aperture and hitting a screen, the Fresnel number F is defined as where λ is wavelength, a is the characteristic size (e.g. radius) of the aperture, and L is the distance of the screen from the aperture. Depending on the value of F the diffraction theory can be simplified into two special cases: Values in between require a more detailed analysis based on the scalar diffraction theory. See also
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Fresnel_number". A list of authors is available in Wikipedia. |