In this book titled ‘Modulewise Engineering Physics’ six modules namely: electromagnetic fields and waves; quantum mechanics; oscillatons; semiconductor physics; applied optics; and laser and optical fiber; are thoroughly discussed. The purpose of this book is to provide in-depth information on the fundamentals of Engineering Physics to the student community to improve their general understanding of the subject. It is primarily designed to serve as a textbook for undergraduate students. It will also serve as a reference book for undergraduate science (B.Sc) students, scientists, technologists, and practitioners of various branches of engineering. The book thoroughly explains all the relevant and important topics in an easy-to-understand manner. Plenty of solved examples and well-labeled illustrations are provided in every module for a better understanding of the concepts and their applications. The overall presentation of this book is concentrated on making the concept as simple as possible, understandable, and more interesting for the students.