| 单词 | light grasp |
| 释义 | > as lemmaslight grasp light grasp n. Astronomy the amount of light that can enter a telescope, binoculars, or other optical device at any instant; light-gathering power. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > astronomical telescopes > qualities of light grasp1869 1869 T. H. Buffham Let. 11 June in Astron. Reg. Aug. 185 I am unable to understand that a certain example of defining power on mere angular subtension is the gauge with which to judge another optical power usually held to be quite distinct from the former, and sometimes designated ‘light-grasp’. 1961 Listener 7 Sept. 353/3 For televising relatively faint objects, such as planets, it is necessary to use a powerful telescope with considerable light-grasp. 2002 P. Moore & J. Watson Astron. with Budget Telescope ii. 8 One of the most important factors is a telescope's light grasp, for it is this that determines how faint an object you can see. < as lemmas |
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