the amount of light that can enter a telescope, binoculars, or other optical device at any instant; light-gathering power.
| 单词 | θ64759 |
| 释义 | the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > astronomical telescopes > qualities of (1) light grasp1869 the amount of light that can enter a telescope, binoculars, or other optical device at any instant; light-gathering power. |
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