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gravitational lensing
(deflection of light)
subjectfact 
gravitational lensinghas synonym deflection of lighthas source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:29:46.0
has definition Gravitational effect that bends a ray of light. Such an effect was predicted within the general theory of relativity, although previously considered impossible.has source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:29:46.0
has definition The apparent path of a photon is altered from a straight line by the gravitational field of the Sun. The path is deflected radially away from the Sun by up to 1".75 at the Sun's limb. Correction for this effect, which is independent of wavelength, is included in the reduction from mean place to apparent place.has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:29:46.0
has definition The bending of the beam of light due to gravity. It is observable when the light from a star or planet passes a massive object such as the Sun.has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:29:46.0
has definition Deflection of electromagnetic radiation from a distant background source by a strong gravitational field associated with a foreground source resulting in more than one image of the original source. Many double-quasars are produced by this phenomenon.has source: McLean, I.S. 1997 Electronic Imaging in Astronomy, Wiley, 2001-09-27 09:29:46.0
has definition The effect of matter in curved spacetime, which tends to focus any beam of radiation from a distant source. In effect, the spacetime curvature is a lens of great focal length. At z ≈ 1, the angular size of an object starts increasing with distance.has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:29:46.0
has definition The bending of light caused by the gravity of an object lying between us and the light source. This may cause the light source to look brighter than it normally does.has source: Croswell, K. 1995 The Alchemy of the Heavens, Anchor Books, 2001-09-27 09:29:46.0
is a kind of radiation direction modification2001-09-27 09:29:46.0
radiation direction modificationchanges property direction2001-09-27 09:29:45.0
optical processhas domain optics2001-09-27 09:29:44.0