This book is intended to serve as a textbook of applied Physics/Physics Paper of the undergraduate students of B.E., B.Tech and B.Sc. Exhaustive treatment of topics in Optics, mechanics, relativistic mechanics, laser, optical fibres and holography have been included. Physics is best learnt by conceptualization of the involved principles and to help the students conceptualize the involved principles, The text has been presented in an easy to understand manner.