Cassegrainian telescope

Thesaurus

Noun

1.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 mirrorGregorian telescopereflecting telescope, reflector - optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece; "Isaac Newton invented the reflecting telescope in 1668"