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* In [[optics]], focus means that an image is correctly rendered on a plane. This involves the focal length of specific [[lens]]es.
* In [[optics]], focus means that an image is correctly rendered on a plane. This involves the focal length of specific [[lens]]es.
* In [[psychology]], focus as a cognitive process means [[Concentration (Psychology)|concentrating]] selectively on a single aspect of one's environment or thoughts while ignoring other things
* In [[psychology]], focus as a cognitive process means [[Concentration (psychology)|concentrating]] selectively on a single aspect of one's environment or thoughts while ignoring other things
* In [[geology]], a focus is a point along a [[fault]] where an [[earthquake]] begins (hypocenter versus [[epicenter]]).<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
* In [[geology]], a focus is a point along a [[fault]] where an [[earthquake]] begins (hypocenter versus [[epicenter]]).<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>