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单词
numeric aperture
释义
numeric aperture
nu·mer·ic ap·er·ture (N.A.),
defined by the formula
n
sine
a
, where
n
is the refractive index of the medium between the object and objective lens and
a
is the angle between the central and the marginal rays entering the objective.
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更新时间:2025/3/20 2:48:10