aperture of an optical system

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• Off-axis optical system — An off axis optical system is an optical system in which the optical axis of the aperture is not coincident with the mechanical center of the aperture. An optical system in which the optical axis of the aperture is not coincident with the… …   Wikipedia

• Aperture — For other uses, see Aperture (disambiguation). f stops demonstrated on a lens …   Wikipedia

• Aperture (disambiguation) — An aperture is an opening, in particular one whose size determines what can or cannot pass through. The term can in particular refer to:*Aperture of an optical system, the opening that limits the amount of light that can pass through *Aperture… …   Wikipedia

• Optical aberration — v · d · e Optical aberration …   Wikipedia

• Optical resolution — This article is about optical resolution in optics. For the method of separating enantiomers in chemistry, see Chiral resolution. Optical resolution describes the ability of an imaging system to resolve detail in the object that is being imaged.… …   Wikipedia

• aperture — apertural /ap euhr choor euhl/, adj. apertured, adj. /ap euhr cheuhr/, n. 1. an opening, as a hole, slit, crack, gap, etc. 2. Also called aperture stop. Optics. an opening, usually circular, that limits the quantity of light that can enter an… …   Universalium

• aperture — noun / ˈæp.ə.tʃə(r), ˈæp.ə.tjʊə(r),ˈæp.ɚ.tʃɚ/ a) An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall. An aperture between the mountains. Gilpin. b) Something which restricts the diameter of… …   Wiktionary

• aperture — noun Etymology: Middle English, from Latin apertura, from apertus, past participle of aperire to open Date: 15th century 1. an opening or open space ; hole 2. a. the opening in a photographic lens that admits the light b …   New Collegiate Dictionary

• 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

• Optical tweezers — (originally called single beam gradient force trap ) are scientific instruments that use a highly focused laser beam to provide an attractive or repulsive force (typically on the order of piconewtons), depending on the refractive index mismatch… …   Wikipedia