focus (math/optics); center of attention
Meanings
3 senses · 7 examplesnoun
focus; focal point (mathematics)
formalIn geometry, a point having a special relationship to a conic section. For example, for an ellipse, the sum of the distances from any point on the ellipse to the two foci is constant.
An ellipse has two foci.
This theorem involves the properties of a parabola's focus.
noun
focus; focal point (optics)
formalThe point where light rays converge after passing through a lens or reflecting off a parabolic mirror.
Please adjust the lens to bring the image into focus.
The telescope's parabolic mirror concentrates starlight at the focal point.
noun
center of attention; focus; crux
neutralFigurative use meaning the central point of interest, discussion, or activity.
The focus of this conference is environmental protection.
His new theory has become the focus of academic debate.
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The media always focuses its attention on celebrities.