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FOCUS (Latin for " hearth " or " fire...

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Originally appearing in Volume V10, Page 587 of the 1911 Encyclopedia Britannica.

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FOCUS (Latin for " hearth " or " fireplace ")

FOCUS (Latin for "
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HEARTH (a word which appears in various forms in several Teutonic languages, cf. Dutch haard, German Herd, in the sense of " floor ")
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

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case called the virtual

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FOCUS (Latin for " hearth " or " fireplace ")

focus (see

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MICROSCOPE (Gr. µucp6s, small, asenreiv, to %view)

MICROSCOPE;

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TELESCOPE

TELESCOPE;

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LENS) . In

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GEOMETRY

geometry the word is used to denote certain points (see GEOMETRY; CONIC

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SECTION; and

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PERSPECTIVE (Lat. peespicere, to see through)

PERSPECTIVE) .

End of Article: FOCUS (Latin for " hearth " or " fireplace ")

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