Joachim Wambsganss
Published 2000-12-20Version 1
Gravitational lensing has established itself as a valuable tool in many astrophysical fields in the roughly 20 years of its existence as an observational science. In this brief review, first the basics of lensing are introduced. Then it is shown that the two propagation effects, gravitational lensing and interstellar scintillation, have a number of properties in common. Finally, various lensing phenomena are discussed with emphasis on recent observations.
Comments: 6 pages, 2 figures; LaTeX2e Kluwer style; invited review, to appear in ``Sources and Scintillations: refraction and scattering in radio astronomy'', Proceedings of IAU Colloquium 182
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