Focus

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Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4715.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4715. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Instrumentation And Observational Techniques, Astronomical Instrumentation

Scientific paper

(1) In optics, the point at which parallel light rays from a distant point source are brought together by a lens or mirror to form an image. Light rays traveling parallel to the optical axis (the line that passes perpendicularly through the center of a lens or mirror) of an ideal convex lens or concave mirror converge to intersect at the focus, or focal point, of the lens or mirror. Rays arriving...

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