| 释义 |
ˈfocal length noun [countable] technical the distance between the centre of a lens and the focal point 焦距Examples from the Corpusfocal length• Properties of a parabola All parabolas are similar. Focal length a determines the magnitude.• A single focal length, fixed-focus is often sufficient.• The image produced by a diverging lens is however frequently virtual and consequently the focal length does not seem easy to determine.ˈfocal length nounChineseSyllable centre a the between distance the of Corpus |