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Topic: Coma optics

Related Topics

Spherical aberration

Reflecting telescope

	Encyclopedia :: encyclopedia : Optics (Site not responding. Last check: 2007-11-01)
		Optics (appearance or look in ancient Greek) is a branch of physics that describes the behavior and properties of light and the interaction of light with matter.
		Optics explains and is illuminated by optical phenomena.
		The ray in geometric optics is perpendicular to the wavefront in wave optics.
	www.hallencyclopedia.com /Optics (670 words)

	coma (Site not responding. Last check: 2007-11-01)
		Likewise, coma is not the same as brain death, which is the irreversible cessation of ''all'' brain activity.
		In astronomy, a coma is the tail of a comet produced by vapor boiled off the comet as it nears the sun.
		In optics, a coma is an optical aberration in an astronomical telescope which causes a V-shaped flare to the image of a star.
	encyclopedia.mysleepcenter.com /coma.htm (739 words)

	Telescope - Wikipedia, the free encyclopedia
		Newtonian or reflecting telescopes employ the reflective properties of light, using a concave paraboic primary mirror to collect and focus incoming light onto a flat secondary (diagonal) mirror that in turn reflects the image through an opening at the side of the main tube and into the eyepiece.
		In this generation of telescopes, the mirror is usually very thin, and is kept in an optimal shape by an array of actuators (see active optics).
		The second, coma, changes as a function of pupil distance and spherical aberration, hence the well-known result that it is impossible to correct the coma in a lens free of spherical aberration by simply moving the pupil.
	en.wikipedia.org /wiki/Telescope (2065 words)

	Encyclopédie :: encyclopedia : Télescope (Site not responding. Last check: 2007-11-01)
		Les miroirs paraboliques générent une aberration optique, dite de coma ; elle déforme les étoiles en bord de champ, ce qui réduit le champ utile.
		Elle repose sur des miroirs primaires et secondaires hyperboliques.
		Cette formule corrige presque totalement les aberrations de coma et de sphéricité.
	www.encyclopedie.cc /T%c3%a9lescope (2946 words)

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