Null geodesics describe the path that light rays follow in
space-time. A better understanding of their properties in any given
space-time is therefore crucial in interpreting the information
they convey to an observer. The main focus of this book is to study
the properties of null geodesics in general relativistic models.
The book is essentially divided into two parts. In the first part,
the (1]3)-covariant formalism is introduced, which will be used to
study null geodesics and their applications to gravitational
lensing. A general form of the null geodesic deviation equation is
derived. The significance of this equation lies in the fact that it
can be used in any given space-time. Various applications of this
equation are studied, including its role in determining
area-distance relations in the Friedmann-Lemaitre-Robertson-Walker
cosmological model. The null geodesic deviation equation is also
used to derive a covariant form of the angle of deflection, showing
its versatile applications in gravitational lensing theory. The
second part of the book involves applying the (1+1+2)-covariant
approach to gravitational lensing in spherically symmetric
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