This book is written specifically to address the course curriculum in Engineering Physics-I (EAS-101) of the B.Tech syllabus of the Uttar Pradesh Technical University. The book is designed to meet the needs of the first-year undergraduate students of all branches of engineering. It provides a sound understanding of the important phenomena in physics. The book exposes the students to fundamental knowledge in: • Special theory of relativity • Wave nature of light such as interference, diffraction, and polarization • Properties and applications of lasers • Types of optical fibres, their geometries, and use in communication systems • Basic principles and applications of holography Key Features • Numerous solved examples in each chapter on the pattern of previous years’ question papers to stress conceptual understanding • Chapter-end model questions to probe a student’s grasp of the subject matter • Chapter-end numerical problems with answers to enhance the student’s problem solving skills