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Focus has several meanings:

  • In optics, focus means that an image is correctly rendered on a plane. This involves the focal length of specific lenses.
  • In psychology, focus as a cognitive process means concentrating selectively on a single aspect of one's environment or thoughts while ignoring other things


  1. Wile, Dr. Jay L. Exploring Creation With Physical Science. Apologia Educational Ministries, Inc. 1999, 2000