| 单词 | Cassegrain telescope |
| 释义 | Word Frequency Cassegrain telescope(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 |
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