Applied physics deals with the application of the principles of physics for solving practical and technological problems. It is also involved in the application of physics to other areas of science. Applied physics seeks to develop new technologies and solve engineering problems. Some of its branches are accelerator physics, biophysics, communication physics, experimental physics and microfluidics. There are numerous fields where applied physics is used for developing technologies such as stealth technology, sonar, lidar, computational physics, quantum technology and semiconductors. It also plays a key role in improving practical investigations such as in experimental nuclear physics and experimental particle physics. This book discusses the fundamentals as well as modern approaches of applied physics. It explores all the important aspects of this field in the present day scenario. This book is a vital tool for all researching and studying this field.