Fresnel number

English

Named after the physicist Augustin-Jean Fresnel.

Fresnel number (plural Fresnel numbers)

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

单词	Fresnel number
释义	Fresnel number English Etymology Named after the physicist Augustin-Jean Fresnel. Noun Fresnel number (plural Fresnel numbers) (optics) A dimensionless quantity (denoted ${\\displaystyle F}$ ), such that for an electromagnetic wave passing through an aperture and hitting a screen, ${\\displaystyle F={\\frac {a^{2}}{L\\lambda }}}$ where ${\\displaystyle a}$ is the characteristic size (e.g. radius) of the aperture, ${\\displaystyle L}$ is the distance of the screen from the aperture, and ${\\displaystyle \\lambda }$ is the incident wavelength.
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