| 单词 |
prime focus |
| 释义 |
prime focus
prime focus n (Astronomy) the focal point of the objective lens or primary mirror of a telescope Translations
prime focus
prime focus The focal plane in which the image of the primary mirror or objective lens of a telescope forms, in the absence of other optical components.prime focus[′prīm ′fō·kəs] (optics) The position in a reflecting telescope at which light from celestial objects is focused by the main mirror, located on the axis of the mirror near the open end of the tube. |
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