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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. : N.A.
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Word History and Origins
Origin of numerical aperture1
First recorded in 1875–80
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Example Sentences
It is generally assumed that a good objective requires an illuminating cone equivalent to two-thirds of its numerical aperture.
From Project Gutenberg
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