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gregorian telescope

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Noun Phrase

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WORDNET DICTIONARY

gregorian telescope(n = noun.artifact) cassegrainian telescope - a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror;

is a kind of reflecting telescope, reflector

gregorian telescope, n. a reflecting telescope in which light reflected from a secondary mirror passes through a hole in a primary mirror.

Etymology

J. Gregory, Sc. mathematician d. 1675, who devised it