Textbook in PDF format This book offers a perfect combination of classical optics and its use in understanding observable phenomena in nature and our surroundings. The science topics of the first part are those typically covered in undergraduate courses on optics. The author gives clear and concise introductions to geometrical optics, wave optics, detectors, and light sources. He also addresses radiometry, photometry, colorimetry, as well as quantum optics of light-matter interactions. End of chapter exercises help readers to test and consolidate their knowledge