孔徑與瞳之處理 為NA， 及光圈數(f-number)(或叫相對孔徑(relative aperture))， 簡寫為FNB。 數值孔徑由下式定義：. 0 sinθ n. NA = （ 2.17）. 其中， n 是折射率。 光圈數(f-number)由 ...
Force | Define Force at Dictionary.com force 1 (fɔːs) —n 1. strength or energy; might; power: the force of the blow; a gale of great force 2. exertion or the use of exertion against a person or thing that resists; coercion 3. physics a. a dynamic influence that changes a body from a state of r
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FOOTBALL OUTSIDERS: Innovative Statistics, Intelligent Analysis Word of Muth: Chicago Bears Preview Ben Muth reveals which offensive lines he'll be covering this season, including the Chicago Bears. How did they improve so drastically in 2013, and can they maintain that improvement this fall? 8 comments, Last Comment
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North American F-86 Sabre - Wikipedia, the free encyclopedia The North American F-86 Sabre (sometimes called the Sabrejet) was a transonic jet fighter aircraft. Produced by North American Aviation, the Sabre is best known as the United States's first swept wing fighter which could counter the similarly-winged Sovie
Natural number - Wikipedia, the free encyclopedia In mathematics, the natural numbers are those used for counting ("there are six coins on the table") and ordering ("this is the third largest city in the country"). These purposes are related to the linguistic notions of cardinal and ordinal numbers, resp
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Numerical aperture - Wikipedia, the free encyclopedia By incorporating index of refraction in its definition, NA has the property that it is constant for a beam as it goes from one ... 1.1 Numerical aperture versus f- number; 1.2 Working (effective) f-number.
