How did ancient peoples manage to find light sources What is a prism This fascinating book looks at the history of light by telling the stories of the scientists who contributed to the various groundbreaking theories such as Hans Lippershey Galileo Galilei and Humphry Davy. It looks at the historical controversies that surrounded the various theories at the time how they were tested and what impact these theories and discoveries have had on the way in which we view the process of light today.