focus

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:

• Focus (jazz album), by Stan Getz
• Focus (album), by the US metal band Cynic
• Focus (band), a 1970s Dutch band
• Focus, a mixtape by Talib Kweli
• Focus, a Hip-Hop producer

In writing:

• Focus (encyclopedia), a Swedish language encyclopedia
• Focus (linguistics), part of a sentence which contributes the most important information
• Focus (German magazine), a German weekly newsmagazine
• Focus (Christian magazine), a Christian magazine
• Focus (novel), a 1945 novel by Arthur Miller
• Focus (film), a 2002 film of the novel
• BBC Focus, a monthly science and technology magazine

Other meanings:

• AGM-87 Focus, a U.S. Navy air-to-surface missile
• Foco Theory, a guerrilla theory made by Che Guevara
• Ford Focus, an automobile in 2 versions:
• Ford Focus (international)
• Ford Focus (North America)
• Helicon Focus, an image software program
• Focus (board game), an abstract strategy game
• Focus, the main news bulletin on Prima TV station, Romania
• Focus (Berlinale), a section of the official programme of the Berlin International Film Festival

Company and Organization names:

• Focus Features, the art house films division of NBC Universal's Universal Studios
• Focus Humanitarian Assistance, an international emergency relief organization
• Focus (DIY), a UK chain of do it yourself stores
• FOCUS (organization), Fellowship of Catholic University Students

FOCUS may mean:

• FOCUS, a domain-specific programming language for data handling and analysis
• FOCUS (hardware), a CPU architecture
• FOCUS Program, a voluntary study program at numerous American universities
• FOCUS Brands, Inc., a food and confectionery company

See also

• Hyperfocus