Optical Engineering by Knowledge Flow is a comprehensive eBook that explores the principles and applications of optics in engineering. Designed for students, researchers, and professionals, it covers key topics such as light propagation, optical systems, lenses, lasers, fiber optics, and imaging technologies. With clear explanations and detailed illustrations, the book simplifies complex optical concepts and demonstrates their real-world applications in fields like telecommunications, medical devices, and instrumentation. Ideal for academic study and practical understanding, this eBook provides a strong foundation in optical engineering, enabling readers to grasp the science behind modern optical technologies and their role in innovation and design.