| 单词 | cassegrain telescope |
| 释义 | Cassegrain telescope[ kas-uh-greyn ] / ˈkæs əˌgreɪn / noun Astronomy.a reflecting telescope in which the light, passing through a central opening in the primary mirror, is brought into focus a short distance behind it by a secondary mirror. Also called Cas·se·grain·i·an tel·escope [kas-uh-grey-nee-uhn]. /ˌkæs əˈgreɪ ni ən/. Origin of Cassegrain telescope1805–15; named after N. Cassegrain, 17th-century French scientist, its inventor Words nearby Cassegrain telescopecassata, cassation, Cassatt, Cassatt, Mary, cassava, Cassegrain telescope, Cassel, Casselberry, Cassel brown, Cassel yellow, cassena Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for Cassegrain telescopeCassegrain telescope / (ˈkæsɪˌɡreɪn) / nounan astronomical reflecting telescope in which incident light is reflected from a large concave paraboloid mirror onto a smaller convex hyperboloid mirror and then back through a hole in the concave mirror to form the image Word Origin for Cassegrain telescopeC19: named after N. Cassegrain, 17th-century French scientist who invented it Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 |
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