refracting telescopes

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• List of largest optical refracting telescopes — Here is a list of the largest optical refracting telescopes sorted by lens diameter and focal length. The largest refractor ever constructed was the Great Paris Exhibition Telescope of 1900. The largest practical functioning refracting telescope… …   Wikipedia

• Refracting telescope — A refracting or refractor telescope is a dioptric telescope that uses a lens as its objective to form an image. The refracting telescope design was originally used in spy glasses and astronomical telescopes but is also used in other devices such… …   Wikipedia

• Télescopes — Télescope Pour les articles homonymes, voir Télescope (homonymie). Un télescope, (du grec tele signifiant « loin » et skopein signifiant « regarder, voir »), est un instrument optique permettant d augmenter la luminosité ainsi …   Wikipédia en Français

• Refracting telescope — Telescope Tel e*scope, n. [Gr. ? viewing afar, farseeing; ? far, far off + ? a watcher, akin to ? to view: cf. F. t[ e]lescope. See {Telegraph}, and { scope}.] An optical instrument used in viewing distant objects, as the heavenly bodies. [1913… …   The Collaborative International Dictionary of English

• List of largest optical reflecting telescopes — The following is a list of the largest optical reflecting telescopes sorted by mirror diameter. Note that two of the first three are not yet operational. This list does not currently include telescopes that are still in the conceptual/proposed… …   Wikipedia

• Timeline of telescopes, observatories, and observing technology — Timeline of telescopes, observatories, and observing technology.Before Common Era (B.C.)2100*Xiangfen Astronomical Observatory, Xiangfen County, Linfen City, Shanxi Province, China 1100* 11th 7th century B.C., Zhou dynasty astronomical… …   Wikipedia

• History of the telescope — The earliest known working telescopes appeared in 1608 and are credited to Hans Lippershey and Zacharias Janssen, spectacle makers in Middelburg, and Jacob Metius of Alkmaar. The design of these early refracting telescopes consisted of a convex… …   Wikipedia

• Optical telescope — Eight Inch refracting telescope (Chabot Space and Science Center) An optical telescope is a telescope which is used to gather and focus light mainly from the visible part of the electromagnetic spectrum for directly viewing a magnified image for… …   Wikipedia

• telescope — /tel euh skohp /, n., adj., v., telescoped, telescoping. n. 1. an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens… …   Universalium

• Telescope — A telescope is an instrument designed for the observation of remote objects and the collection of electromagnetic radiation. The first known practically functioning telescopes were invented in the Netherlands at the beginning of the 17th century …   Wikipedia

• Newtonian telescope — The Newtonian telescope is a type of reflecting telescope invented by the British scientist Sir Isaac Newton (1642–1727), using a concave primary mirror and a flat diagonal secondary mirror. Newton’s first reflecting telescope was completed in… …   Wikipedia