cassegrainian telescope

Cassegrain telescope

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-uhn] .

1805–15; named after N. Cassegrain, 17th-century French scientist, its inventor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Cassegrain telescope (ˈkæsɪˌɡreɪn)
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
[C19: named after N. Cassegrain, 17th-century French scientist who invented it]

Collins English Dictionary - Complete & Unabridged 10th Edition
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