Rays Waves and Photons presents the foundational concepts of optical science. Written by subject, each topic is presented in a standalone chapter with a brief historical foundation, current developments, and future predictions. With non-technical language, this book provides accessible content with terms, concepts and definitions, a glossary, and appendices to enhance the reader's experience. More than forty subjects are discussed including: optical design, lenses, cameras, microscopes, telescopes, lasers, fibers, missiles, autonomous cars and remote sensing. This book will provide a useful resource for students, teachers, professionals, and general audiences interested in the complexity of optical phenomena and devices. Part of iopscience.iop.org/bookListInfo/emerging-technologies-in-optics-and-photonics#series.