This book offers a simple, clear-cut treatment of optical engineering without burdening the reader with advanced physics and involved mathematical theory. Intended mainly as a tutorial text, it elucidates those concepts that are common to optical engineering and the subject of optics in general and which are usually explained assuming advanced technical background of the reader. The fundamental nature of light is first presented. Subsequently the basics of optical design, the key issues a design engineer has to resolve, the primary components of optical systems, optical materials and the calculations involved in the design and the evaluation of the performance of optical systems are presented. The informal style the book adopts and the modest technical background it assumes of the reader not only render it strikingly reader-friendly but also distinguish it as one of immense utility for students as well as for engineers and designer who need to understand more advanced topics.