In optics, the Airy disk (or Airy disc) and Airy pattern are descriptions of the best focused spot of light that a perfect lens with a circular aperture can make, limited by the diffraction of light. The diffraction pattern resulting from a uniformly-illuminated circular aperture has a bright region in the center, known as the Airy disk which toge...
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http://en.wikipedia.org/wiki/Airy_disk
Named after George Airy, it is the central spot in a diffraction pattern of a stars image in focus in a telescope.
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(from the article `optics`) When a well-corrected lens is used in place of a pinhole, the geometrical ray divergence is eliminated by the focussing action of the lens, and a ... ...in 1827 made the first successful attempt to correct astigmatism in the human eye (his own) by use of a cylindrical eyeglass lens. He also ... ...system c...
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http://www.britannica.com/eb/a-z/a/34
The central spot in the diffraction pattern of the image of a star at the focus of a telescope, named after George Airy. It is surrounded by several fine diffraction rings like the rings around the bull`s-eye of a target. The size of the Airy disk, given approximately in radians by 1.22 times the wa...
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http://www.daviddarling.info/encyclopedia/A/Airy_disk.html
<microscopy> The image of a bright point object as focused by a lens system. With monochromatic light, it consists of a central point of maximum intensity surrounded by alternate circles of light and darkness caused by the reinforcement and interference of diffracted rays. The light areas are called maxima and the dark areas minima. The distr...
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http://www.encyclo.co.uk/local/20973
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