This book, now in its Second Edition, is written to address the requirements of the course curriculum in engineering physics for first-year students of all branches of engineering. This text emphasises the basic concepts of physics. It exposes students to fundamental knowledge in several topics such as ultrasonics and their industrial and medical applications, properties of lasers and their industrial and medical applications, types of optical fibres, their geometries and use in communication systems, and types of optical instruments and their usage. The book contains numerous solved problems, short and descriptive type questions, and exercise problems to help students assess their progress and familiarise themselves with the types of questions set in examinations. New chapters on: Elasticity Thermal physics Acoustics New sections on Non-linear optics Direct and indirect bandgap Crystal growth