Focused on the transmission of energy by wave propagation, in particular electromagnetism, acoustics and optics, this text includes information on matrix applications to coupled oscillations, optical systems and multi-layer dielectric films. Chapters have been added and include Simple Harmonic Motion, and Non-linear Waves, Shocks and Solitons. There are also sections on electromagnetic waves in the ionosphere and other plasmas, the laser cavity, and optical wave guides. This edition contains increased discussion of solitons, such as their role in optical transmission lines, collisionless shocks in space, non-periodic lattices, and their connection with Schrodinger's equation. It also provides readers with a large number of problems, along with hints on how to solve them.