| 单词 | Ramsden eyepiece |
| 释义 | Ramsden eyepiece Optics. an eyepiece consisting of two plano-convex crown-glass lenses of equal focal length, placed with the convex sides facing each other and with a separation between the lenses of about two-thirds of the focal length of each. [1840-50; named after Jesse Ramsden (1735-1800), English maker of astronomical instruments] |
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