'I recommend this supplementary textbook as a clear tutorial for understanding the basic concepts of waves and the wave equation with its applications to mechanics, electromagnetic waves and the Schrӧdinger equation. … It is written for undergraduates in physics and engineering, but it also has exceptional value to a wider readership. … Physical insights that are helpful for a deep understanding of waves are uniquely presented. The text is supplemented with clear and useful graphs. The book's website contains additional resources: worked solutions to all problems, animated graphics, a few errata, and author podcasts to augment all the chapters.' Barry R. Masters, Optics and Photonics News