Fresnel number

名词 n.
中文释义

英文释义

名词 n.
  1. 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.

词形变化

Fresnel numbers plural

词源

Named after the physicist Augustin-Jean Fresnel.
0 次浏览 数据来源: Wiktionary