- medium aperture
- средняя апертура
English-Russian small dictionary of medicine. 2015.
medium aperture
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Aperture priority — Aperture priority, often abbreviated Av (for Aperture value) or A on a camera dial, is a setting on some cameras that allows the user to choose a specific aperture value while the camera selects a shutter speed to match. The camera will ensure… … Wikipedia
Aperture Foundation — Aperture was founded in 1952 by Ansel Adams, Minor White, Barbara Morgan, Dorothea Lange, Nancy Newhall, Beaumont Newhall, Ernest Louie, Melton Ferris, and Dody Warren. Their vision was to create a forum for fine art photography, a new concept at … Wikipedia
Aperture-to-medium coupling loss — In telecommunication, aperture to medium coupling loss is the difference between the theoretical gain of a very large antenna, such as the antennas in beyond the horizon microwave links, and the gain that can be realized in practice. Note 1:… … Wikipedia
aperture — 1. An inlet or entrance to a cavity or channel. in anatomy, an open gap or hole. SEE ALSO: fossa, ostium, orifice, pore. 2. The diameter of the objective of a microscope. SYN … Medical dictionary
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
Angular aperture — The angular aperture of a lens is the apparent angle of the lens aperture as seen from the focal point::a = 2 arctan left( frac {D/2} {f} ight)where :f is the focal length:D is the diameter of the aperture. Relation to numerical aperture In a… … Wikipedia
relative aperture — Optics. the ratio of the diameter of a lens, esp. a camera lens, to the focal length; the reciprocal of the f number or focal ratio of the lens. * * * ▪ optics the measure of the light gathering power of an optical system. It is expressed… … Universalium
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 — (= 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 …
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
