focal length

From Longman Dictionary of Contemporary Englishfocal lengthˈfocal length noun [countable] technical the 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.

单词	focal length
释义	focal length From Longman Dictionary of Contemporary Englishfocal lengthˈfocal length noun [countable] technical the 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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