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| 单词 | focal length |
| 释义 | focal length From Longman Dictionary of Contemporary Englishfocal lengthˈfocal length noun [countable] technicalthe distance between the centre of a lens and the focal pointExamples 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. |
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