. . . . . . "Gregorian telescope"@en-us . "02978478-n"^^ . "Cassegrainian telescope"@en-us . "0"^^ . . . . "102400390"@en-us . "102872374"@en-us . "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"@en-us . "0"^^ . . "102978478"^^ . .