Beyond the narrow band of light visible to the human eye lie two regions of the electromagnetic spectrum that quietly influence daily life: ultraviolet and infrared radiation.Beyond the narrow band of light visible to the human eye lie two regions of the electromagnetic spectrum that quietly influence daily life: ultraviolet and infrared radiation. This book introduces you to the physics behind these forms of invisible light and explains how they are detected, measured, and applied across science and industry. You will learn about the role of ultraviolet light in astronomy, medicine, and disinfection, as well as how infrared radiation supports thermal imaging, communication technologies, and climate research. The book also considers the biological effects of exposure to these wavelengths and the safety measures involved in working with them. Written with the assistance of artificial intelligence and reviewed for clarity and accuracy, this book offers a straightforward, factual introduction for readers curious about the science shaping the technologies around them.Beyond the narrow band of light visible to the human eye lie two regions of the electromagnetic spectrum that quietly influence daily life: ultraviolet and infrared radiation. This book introduces you to the physics behind these forms of invisible light and explains how they are detected, measured, and applied across science and industry. You will learn about the role of ultraviolet light in astronomy, medicine, and disinfection, as well as how infrared radiation supports thermal imaging, communication technologies, and climate research. The book also considers the biological effects of exposure to these wavelengths and the safety measures involved in working with them. Written with the assistance of artificial intelligence and reviewed for clarity and accuracy, this book offers a straightforward, factual introduction for readers curious about the science shaping the technologies around them.