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focus, in optics, the point at which rays converge after reflection by a concave mirror or refraction by a convex lens, also known as a real focus. The point from which rays appear to diverge after reflection by a convex mirror or refraction by a concave lens is known as a virtual focus. See image.

Focus may refer to:

In science, mathematics or computing:

  • Focus (optics), a point toward which light rays are made to converge
    • Autofocus, a feature of some optical systems that obtains and maintains correct focus on a target
    • Focal length, a measure of how strongly a lens focuses or diverges light
  • Focus (earthquake), an earthquake's underground point of origin or hypocenter
  • Focus (geometry), a special point used in describing conic sections
  • Focus (computing), a component of the graphical user interface which is currently selected
  • Focus (grammar), a phenomenon in Austronesian languages
  • Focusing, an activity related to psychotherapy

In music:

In writing:

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FOCUS may mean:

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