Online Encyclopedia

APERTURE (from Lat. aperire, to open)

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