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Aperture: In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane.
Aperture (software): Aperture is a discontinued image organizer, once developed by Apple Inc. for the macOS operating system, first released in 2005, which was available from the Mac App Store.
Aperture synthesis: Aperture synthesis or synthesis imaging is a type of interferometry that mixes signals from a collection of telescopes to produce images having the same angular resolution as an instrument the size of the entire collection. At each separation and orientation, the lobe-pattern of the interferometer produces an output which is one component of the Fourier transform of the spatial distribution of the brightness of the observed object.
Aperture grille: An aperture grille is one of two major technologies used to manufacture color cathode ray tube televisions and computer displays; the other is the shadow mask. Fine vertical wires behind the front glass of the display screen separate the different colors of phosphors into strips.
Aperture (mollusc): The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term aperture is used for the main opening in gastropod shells, scaphopod shells, and also for Nautilus and ammonite shells.