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Cassegrainian telescope
/kˌasɪɡɹˈeɪniən tˈɛlɪskˌəʊp/
/kˌæsɪɡɹˈeɪniən tˈɛlɪskˌoʊp/Cassegrainian telescope
01
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
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