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单词 numerical aperture
释义

Definition of numerical aperture in English:

numerical aperture

noun

  • A measure of the resolving power of a microscope objective (for a given wavelength), equal to the product of the refractive index of the medium in front of it and the sine of the semi-angle of the cone it subtends at the centre of the object.

Origin

Late 19th century; earliest use found in Journal of the Royal Microscopical Society.

Definition of numerical aperture in US English:

numerical aperture

noun

  • A measure of the resolving power of a microscope objective (for a given wavelength), equal to the product of the refractive index of the medium in front of it and the sine of the semi-angle of the cone it subtends at the centre of the object.

Origin

Late 19th century; earliest use found in Journal of the Royal Microscopical Society.
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更新时间：2025/6/20 9:34:12