| 单词 |
galilean telescope |
| 释义 |
Galilean telescope
Galilean telescope n (General Physics) a type of telescope with a convex objective lens and a concave eyepiece; it produces an erect image and is suitable for terrestrial use Thesaurus| Noun | 1. |  Galilean telescope - a type of refracting telescope that is no longer used in astronomyrefracting telescope - optical telescope that has a large convex lens that produces an image that is viewed through the eyepiece |
Galilean telescope
 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. Galilean telescope
Related to Galilean telescope: Keplerian telescopeWords related to Galilean telescopenoun a type of refracting telescope that is no longer used in astronomyRelated Words |
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