numerical aperture
The property of a microscope lens that determines how much light can enter and how great a resolution the lens can provide.

Microbiology. . 2009.

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  • Numerical aperture — The numerical aperture with respect to a point P depends on the half angle θ of the maximum cone of light that can enter or exit the lens. In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes… …   Wikipedia

  • numerical aperture — (= N.A.) For a lens the resolving power depends upon the wavelength of light being used and inversely upon the numerical aperture. The N.A. is the product of the refractive index of the medium (1 for air, 1.5 for immersion oil) and the sine of… …   Dictionary of molecular biology

  • numerical aperture — /njuˌmɛrɪkəl ˈæpətʃə/ (say nyooh.merikuhl apuhchuh) noun a measure of the resolving power of a microscope, equal to the product of the refractive index of the medium in which the object is placed and the size of the angle between the axis and the …   Australian English dictionary

  • numerical aperture — skaitinė apertūra statusas T sritis Standartizacija ir metrologija apibrėžtis Objektyvo parametras, išreikštas aplinkos, esančios tarp tiriamojo objekto ir mikroskopo objektyvo, lūžio rodiklio n ir į objektyvą patenkančio šviesos pluošto sudaryto …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • numerical aperture — skaitinė apertūra statusas T sritis fizika atitikmenys: angl. numerical aperture vok. numerische Apertur, f rus. числовая апертура, f pranc. ouverture numérique, f …   Fizikos terminų žodynas

  • numerical aperture — nu·mer·i·cal aperture n(y)u̇ mer i kəl n a number that indicates the resolving power of a microscope objective and is equal to the product of the index of refraction of the medium (as immersion oil) in front of the objective and the sine of half… …   Medical dictionary

  • numerical aperture — Micros. 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… …   Universalium

  • numerical aperture — noun : a quantity that indicates the resolving power of a microscope objective and that is numerically equal to the product of the index of refraction of the medium in front of the objective and the sine of the angle which the most oblique ray… …   Useful english dictionary

  • Launch numerical aperture — In telecommunications, launch numerical aperture (LNA) is the numerical aperture of an optical system used to couple (launch) power into an optical fiber. LNA may differ from the stated NA of a final focusing element if, for example, that element …   Wikipedia

  • small numerical aperture optical fiber — optinė mažos skaitinės apertūros skaidula statusas T sritis radioelektronika atitikmenys: angl. small numerical aperture optical fiber vok. Lichtfasser mit kleiner numerischer Apertur, f rus. оптическое волокно с малой числовой апертурой, n pranc …   Radioelektronikos terminų žodynas

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