Galilean telescope


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Related to Galilean telescope: Keplerian telescope
Ray path in Galilean telescopeclick for a larger image
Ray path in Galilean telescope

Galilean telescope

() The first type of astronomical telescope, developed in 1609 by Galileo from Hans Lippershey's ‘magic tubes’. It is a refractor made up from a single long-focus object lens and a powerful diverging lens used as an eyepiece (see illustration). This optical system, which gives an upright image, survives in modern opera glasses. Galileo's best telescopes had a magnification of about 30 times; although very imperfect, they led to the great achievements of 17th-century astronomy. See also telescope.

Galilean telescope

[‚gal·ə¦lē·ən ′tel·ə‚skōp]
(optics)
A refracting telescope whose objective is a converging (convex) lens and whose eyepiece is a diverging (concave) lens; it forms erect images. Also known as Galilean glass.