Lectionary Calendar
Thursday, July 17th, 2025
the Week of Proper 10 / Ordinary 15
the Week of Proper 10 / Ordinary 15
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Bible Encyclopedias
Focus
1911 Encyclopedia Britannica
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(Latin for "hearth" or "fireplace"), a point at which converging rays meet, toward which they are directed, or from which diverging rays are directed; in the latter case called the virtual focus (see Microscope; Telescope; Lens). In geometry the word is used to denote certain points (see Geometry; Conic Section; and Perspective).
Copyright Statement
These files are public domain.
These files are public domain.
Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Focus'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/f/focus.html. 1910.
Chisholm, Hugh, General Editor. Entry for 'Focus'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/f/focus.html. 1910.
