numerical aperture

noun Microscopy.
a measure of the resolving power of a microscope, equal to the index of refraction of the medium in which the object is placed multiplied by the sine of the angle made with the axis by the most oblique ray entering the instrument, the resolving power increasing as the product increases. Abbreviation: N.A.

1875–80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To numerical aperture
Previous Definition: numerical analysis
Next Definition: numerical control
Words Near: numerical aperture
More from
Synonyms and Antonyms for numerical aperture
More from
Search for articles containing numerical aperture Word FAQs presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.

Example sentences
We are also developing correlated light microscopy methods, specifically high-numerical aperture cryo-light microscopy.
Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature