4.1 Multiply-imaged quasarsGravitational Lensing in Astronomy3.7 Time delay and ``Fermat's''

4 Lensing Phenomena 

In this section, we describe different groups of gravitational lens observations. The subdivision is pragmatic rather than entirely logical. It is done partly by lensed object, or by lensing object, or by lensing strength. The ordering roughly reflects the chronological appearance of different sub-disciplines to lensing. The following sections are on:

Comprehensive reviews could be written on each separate subject. Hence the treatment here can be only very cursory.





4.1 Multiply-imaged quasarsGravitational Lensing in Astronomy3.7 Time delay and ``Fermat's''

image Gravitational Lensing in Astronomy
Joachim Wambsganss
http://www.livingreviews.org/lrr-1998-12
© Max-Planck-Gesellschaft. ISSN 1433-8351
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