Fresnel number
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English[edit]
Etymology[edit]
Named after the physicist Augustin-Jean Fresnel.
Noun[edit]
Fresnel number (plural Fresnel numbers)
- (optics) A dimensionless quantity (denoted ), such that for an electromagnetic wave passing through an aperture and hitting a screen, where is the characteristic size (e.g. radius) of the aperture, is the distance of the screen from the aperture, and is the incident wavelength.