| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024Rams′den eye′piece [Optics.]- Opticsan 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.
- named after Jesse Ramsden (1735–1800), English maker of astronomical instruments 1840–50
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