This textbook, which is primarily designed for undergraduate engineering students of all branches, offers a solid understanding of the basic ideas and principles of physics in a clear and understandable manner. The book's 18 chapters, which cover topics including oscillations and waves, interference of light, diffraction, polarisation, optical tools, lasers, fibre optics, mechanics, and special theory of relativity, introduce students to the fundamentals of these topics. In addition to providing a thorough theoretical examination of these subjects, it also offers a profound understanding of a number of cutting-edge subjects, including acoustics, ultrasonics, and nanotechnology, along with their applications. At the conclusion of each chapter, teaching tools like solved numerical problems and review questions are also provided.