Light Visible And Invisible

Light phenomena have intrigued humankind since prehistory. Think of the rainbow, a sunset on the sea, a game of shadows. Humans have always used light for their own needs, from cooking food to illuminating a room. However, light is not only limited to what we can see with our eyes. The invisible part of the electromagnetic spectrum is broad and dynamic. This book outlines the mysteries and wonders of electromagnetism, heat, and light. It also covers the history of our scientific understanding of light. The dark as well as the bright sides of light are fully explored in these pages, from their impact on our world to their use in cutting-edge technologies in a variety of fields. Numerous full-color images and drawings complement the text, and light phenomena are explained in a simple and engaging way.

The 5 class sessions, of 45-60 minutes each, deepen student understanding of the electromagnetic spectrum, enabling students to detect and consider wavelengths other than visible light. Activities feature energy stations, including infrared (TV remote); microwave (pager); ultraviolet (black light) and other devices. Students come up with their own tests to see what blocks each wavelength, and what does not. They learn how these other wavelengths can be used to "see" things we cannot see with our eyes.

Significant numbers of physicists began working in association with hospitals following the discovery of X-Rays and radioactivity in the late 1890s. This book introduces the reader to medical radiation physics using the developments from the early days as a means of explaining the underlying science. The first chapter provides basic information on x-rays and radioactivity. This is followed by their diagnostic and therapeutic applications. Recent developments involving non-ionising ultraviolet, visible and infrared radiations, and the use of lasers are covered in the following chapters. The last part explains the use of ultrasound and magnetic fields./a

A classic treatise on optics and color theory by Sir William Huggins, one of the foremost astronomers of the Victorian era. The book provides a detailed analysis of the properties of light, including its wave and particle nature, and its relationship to electromagnetic radiation. This volume is a must-read for anyone interested in the history of science or the physics of light. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.