かいこうすう
開口数
1. numerical aperture (in photography)
2. Numerical apertureIn optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light. By incorporating index of refraction in its definition, NA has the property that it is constant for a beam as it goes from one material to another provided there is no optical power at the interface. The exact definition of the term varies slightly between different areas of optics.
Read “Numerical aperture” on English Wikipedia
Read “開口数” on Japanese Wikipedia
Read “Numerical aperture” on DBpedia
Read “Numerical aperture” on English Wikipedia
Read “開口数” on Japanese Wikipedia
Read “Numerical aperture” on DBpedia
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