Ray Optics, Fermat's Principle, and Applications to General Relativity (Paperback, Softcover Repri)

From Maxwell's equations to ray optics.- to Part I.- Light propagation in linear dielectric and permeable media.- Light propagation in other kinds of media.- A mathematical framework for ray optics.- to Part II.- Ray-optical structures on arbitrary manifolds.- Ray-optical structures on Lorentzian manifolds.- Variational principles for rays.- Applications.