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Q: define focus
A: –noun 1. a central point, as of attraction, attention, or activity: The need to prevent a nuclear war became the focus of all diplomatic efforts. 2. Physics . [ a point at which rays of light, heat, or other radiation, meet after being refracted or reflected. 3. Optics . a. the focal point of a lens. b. the focal length of a lens. c. the clear and sharply defined condition of an image. d.
the position of a viewed object or the adjustment of an optical device necessary to produce a clear image: in focus; out of focus. 4. Geometry . (of a conic section) a point having the property that the distances from any point on a curve to it and to a fixed line have a constant ratio for all points on the curve. 5. Geology . the point of origin of an earthquake. 6. Pathology . the primary center from which a disease develops or in which it localizes. –verb (used with object) 7. to bring to a focus or into focus: to focus the lens of a camera. 8. to concentrate: to focus one's thoughts. –verb (used without object) 9. to become focused. ]
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User: what is eccentricity in earth science

User: define focus

Weegy: –noun 1. a central point, as of attraction, attention, or activity: The need to prevent a nuclear war became the focus of all diplomatic efforts. 2. Physics . [ a point at which rays of light, heat, or other radiation, meet after being refracted or reflected. 3. Optics . a. the focal point of a lens. b. the focal length of a lens. c. the clear and sharply defined condition of an image. d. the position of a viewed object or the adjustment of an optical device necessary to produce a clear image: in focus; out of focus. 4. Geometry . (of a conic section) a point having the property that the distances from any point on a curve to it and to a fixed line have a constant ratio for all points on the curve. 5. Geology . the point of origin of an earthquake. 6. Pathology . the primary center from which a disease develops or in which it localizes. –verb (used with object) 7. to bring to a focus or into focus: to focus the lens of a camera. 8. to concentrate: to focus one's thoughts. –verb (used without object) 9. to become focused. ]
Expert answered|debnjerry|Points 13048|



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Asked 5/19/2011 9:22:50 AM
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Weegy: The longer of the two lines about which an ellipse is symmetrical; the axis that passes through both focuses of an ellipse. (More)
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