英语词汇“effective focal length”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	effective focal length
释义	DictionarySeefocal length effective focal length effective focal length The property of a compound lens, such as an eyepiece, that is analogous to the focal length of a single thin lens and can be used, for example, in the determination of magnifying power. For a two-lens system the effective focal length, f , is given by 1/f = 1/f ₁ + 1/f ₂ – d /f ₁ f ₂ where f ₁ and f ₂ are the focal lengths of the components and d is their separation. AcronymsSeeEFL
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