Physics is the foundation of many important disciplines and contributes directly to others as it concerns with matter, energy and their interactions. Learning physics can be an enjoyable experience for a curious student as it fulfils the thirst for knowledge of nature. This book entitled 'Components of Applied Physics' has been written keeping in view the need of undergraduate students of Engineering and Science colleges of various universities in India as well as around the globe. The book is written in a very simple and concise way to understand the subject, its basic concepts and principles. The book communicates wave optics, quantum physics, wave structure, optical fibre and electron optics in an explicit way. To clarify the concepts and make the topic interesting, a number of solved examples, questions and exercises are incorporated in proper places. A list of Activities to be done by the students is also given in this book.