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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 Cassegrainian telescope
[kas-uh-grey-nee-uh n] /ˌkæs əˈgreɪ ni ən/ (Show IPA)
Origin of Cassegrain telescope
1805-15; named after N. Cassegrain, 17th-century French scientist, its inventor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for Cassegrain telescope

Cassegrain telescope

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
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
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