"Confocal" is a word in ENGLISH
confocal
ENGLISH
Definition:
Having the same foci; as, confocal quadrics.
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The convergence to different foci, by a lens or mirror, of rays of light emanating from one and the same …
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of Focus
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A curve formed by a section of a cone, when the cutting plane makes a greater angle with the base …
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One of foci of an ellipse, or other curve.
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