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Topic: Active optics

	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.
		The field of optics usually describes the behavior of visible, infrared and ultraviolet light; however because light is an electromagnetic wave, analogous phenomena occur in X-rays, microwaves, radio waves, and other forms of electromagnetic radiation.
		The ray in geometric optics is perpendicular to the wavefront in wave optics.
	www.hallencyclopedia.com /Optics (670 words)

	Telescope - Wikipedia, the free encyclopedia
		Later, Johannes Kepler described the optics of lenses (see his books Astronomiae Pars Optica and Dioptrice), including a new kind of astronomical telescope with two convex lenses (a principle often called the Kepler telescope).
		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).
	en.wikipedia.org /wiki/Telescope (2065 words)

	telescope - HighBeam Encyclopedia (Site not responding. Last check: 2007-11-01)
		The Maksutov telescope, invented by D. Maksutov in 1941, is similar in design and purpose to the Schmidt telescope but has a spherical meniscus in place of the correcting plate of the Schmidt.
		Equal in importance to the mirrors and lenses constituting the optics of a telescope is the mounting of the telescope.
		The twin Keck telescopes, in domes a few hundred feet apart, have adaptive optics that make them equivalent in resolving power to a telescope with a mirror 280 ft (85 m) across.
	www.encyclopedia.com /html/t/telescop.asp (1922 words)

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