Astigmatism

Details Astigmatism Astigmatism

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4784.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4784. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Instrumentation And Observational Techniques, Astronomical Instrumentation

Scientific paper

An optical aberration whereby a lens (or mirror) has different focal lengths in planes that are perpendicular to each other. In general, if light rays from a point source enter a lens at an angle to its optical axis (the line passing perpendicularly through the center of the lens), the focal length for rays that lie in the plane defined by the direction of the source and the optical axis (the `t...

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