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⇱ numerical aperture - WordReference.com Dictionary of English


WordReference Random House Unabridged Dictionary of American English © 2026
numer′ical ap′erture, [Micros.]
  1. Opticsa 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. Abbr.: N.A.
  • 1875–80

'numerical aperture' also found in these entries (note: many are not synonyms or translations):

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