Online Encyclopedia

APERTURE (from Lat. aperire, to open)

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Originally appearing in Volume V02, Page 163 of the 1911 Encyclopedia Britannica.
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APERTURE (from
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Lat. aperire, to open)  , an opening, In
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optics, it is that portion of the
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diameter of an
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object-
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glass or
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mirror through which
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light can pass
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free from obstruction . It is equal to the actual diameter of the
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cylinder of rays admitted by a
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telescope .

End of Article: APERTURE (from Lat. aperire, to open)
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