The study of properties, characteristics, and behavior of light and its relation with matter is known as optics. This field includes learning about the characteristics of infrared, ultraviolet and visible light. It also incorporates the construction of instruments and machines that use and detect light. This book outlines the processes and applications of optics in detail. It lays special attention on the theories and techniques related to the field. The book explores all the important aspects of this area in the present day scenario like quantum optics, physical optics, and fiber optics, etc. It presents the complex subject of optics in the most comprehensible and easy to understand language. Students, researchers, experts and all associated with this field will benefit alike from the book.