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.

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Also called Cas·se·grain·i·an tel·escope [kas-uh-grey-nee-uhn]. /ˌkæs əˈgreɪ ni ən/.

Origin of Cassegrain telescope

1805–15; named after N. Cassegrain, 17th-century French scientist, its inventor

Words nearby Cassegrain telescope

cassata, cassation, Cassatt, Cassatt, Mary, cassava, Cassegrain telescope, Cassel, Casselberry, Cassel brown, Cassel yellow, cassena
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for Cassegrain telescope

Cassegrain telescope
/ (ˈkæsɪˌɡreɪn) /

noun

an 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 telescope

C19: 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