英语词汇“cassegrainian telescope”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	cassegrainian telescope
释义	cas·se·grain·i·an telescope \\|kasə\|grānēən-\ noun Usage: usually capitalized C Etymology: N. Cassegrain 17th century French physician who invented it in 1672 + English -ian : a reflecting telescope that has a paraboloidal primary mirror and hyperboloidal secondary mirror, is equivalent in its optical effects to a telephoto lens, and usually has the light brought to a focus through a perforation in the center of the primary mirror
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