英语词汇“cassegrain 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	cassegrain telescope
释义	Trends of Cassegrain telescope View usage for: Cassegrain telescope in British English (ˈkæsɪˌɡreɪn) noun an astronomical reflecting telescope in which incident light is reflected from a large concave paraboloid mirror onto a smaller convex hyperboloid mirror and then back through a hole in the concave mirror to form the image Word origin C19: named after N. Cassegrain, 17th-century French scientist who invented it Cassegrain telescope in American English (ˈkæsəˌɡrein) noun Astronomy a reflecting telescope in which the light, passing through a central opening in the primary mirror, is brought into focus a short distance behind it by a secondary mirror Also called: Cassegrainian telescope (ˌkæsə ˈɡreiniən) Word origin [1805–15; named after N. Cassegrain, 17th-century French scientist, its inventor]This word is first recorded in the period 1805–15. Other words that entered Englishat around the same time include: alpaca, diminishing returns, one-sided, platinum, polarization
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Trends ofCassegrain telescope