numerical aperture

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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.

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Origin of numerical aperture

First recorded in1875–80

Words nearby numerical aperture

numerate, numeration, numerator, numerical, numerical analysis, numerical aperture, numerical control, numerical identity, numerical taxonomy, numerical weather prediction, numerology

Example sentences from the Web for numerical aperture

Its 8-megapixel camera, inclusive of true-tone and dual-LED f/2.2 aperture flashes, features optical image stabilization.
Why Every Home Needs a Drone This Holiday|Charlie Gilbert|December 8, 2014|DAILY BEAST
A numerical data set helps physicians and other doctors know when to order scans of any kind.
Are Routine Scans Causing Cancer?|Dale Eisinger|September 17, 2014|DAILY BEAST
“Administration officials favorite phrase these days is that, ‘you have to widen the aperture,’” says Bockenfeld.
Obama To Cut Middle East Democracy Programs|Jamie Dettmer|January 2, 2014|DAILY BEAST
If the cover of Black Aperture made a more daring use of black it would have earned my respect.
You Can Indeed Judge a Book By Its Cover|Brian Gresko|November 20, 2013|DAILY BEAST

Shares of the youth-oriented social-media company push past an important numerical barrier.
Facebook Stock Pushes Above $40|Sarah Langs|August 23, 2013|DAILY BEAST
In the aperture of the window, amid piles of paper, stood a rickety old table, covered with dust.
Hilda Lessways|Arnold Bennett
Hilda suggested that the ticket-clerk should be interrogated, but the aperture of communication with him was shut.
Hilda Lessways|Arnold Bennett
The light which discovered its dismal bounds to his solitary eyes, came from a small grated aperture in the vaulted roof.
The Pastor's Fire-side Vol. 3 of 4|Jane Porter
As “t” stands for 1, and o and y are vowels, and have no figure value, the numerical value of Toy must be 1.
Assimilative Memory|Marcus Dwight Larrowe (AKA Prof. A. Loisette)
Indeed it could hardly have seemed possible to him, that the Duke could have withdrawn himself through that aperture.
The Pastor's Fire-side Vol. 3 of 4|Jane Porter

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