Results for « 卡 塞 格伦 望远镜 » (cmn)
02978478-n
卡 塞 格伦 望远镜, 卡塞格伦望远镜, 格雷 哥里 望远镜, 格雷哥里望远镜
Cassegrainian telescope, Gregorian 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

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