Fresnel number (English, noun)
expansion: Fresnel number (plural Fresnel numbers)
Senses:
topics: engineering
natural-sciences
optics
physical-sciences
physics
glosses: A dimensionless quantity (denoted F), such that for an electromagnetic wave passing through an aperture and hitting a screen, F=(a²)/(Lλ) where a is the characteristic size (e.g. radius) of the aperture, L is the distance of the screen from the aperture, and λ is the incident wavelength.
Forms:
form: Fresnel numbers
tags: plural