Galilean telescope

Galilean telescope
a refracting telescope that forms an erect image, consisting of an objective of relatively long focal length that causes light rays to converge and an eyepiece of short focal length that causes them to diverge.
[1715-25]

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      instrument for viewing distant objects, named after the great Italian scientist Galileo Galilei (1564–1642), who first constructed one in 1609. With it, he discovered Jupiter's four largest satellites, spots on the Sun, phases of Venus, and hills and valleys on the Moon. It consists of a convergent lens as objective (i.e., the lens that forms the image); and its eyepiece (or ocular), placed in front of the focus, is a divergent lens. An upright image is produced. This simple refracting telescope is still used in modern opera glasses, which are low-powered binoculars.

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Universalium. 2010.

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Look at other dictionaries:

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  • Galilean telescope — noun a type of refracting telescope (refractor) similar to the one used by Galileo Galilei Syn: Galilean refractor …   Wiktionary

  • Galilean telescope — noun a type of refracting telescope that is no longer used in astronomy • Hypernyms: ↑refracting telescope …   Useful english dictionary

  • Galilean telescope — noun an astronomical telescope of the earliest type, with a biconvex objective and biconcave eyepiece …   English new terms dictionary

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