Fresnel number

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English

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Fresnel number

Etymology

Named after the physicist Augustin-Jean Fresnel.

Noun

Fresnel number (plural Fresnel numbers)

(optics) A dimensionless quantity (denoted $F$ ), such that for an electromagnetic wave passing through an aperture and hitting a screen, $F={\frac {a^{2}}{L\lambda }}$ where $a$ is the characteristic size (e.g. radius) of the aperture, $L$ is the distance of the screen from the aperture, and $\lambda$ is the incident wavelength.

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