Light is our impression of the world. Because of light, we can see the world and perceive changes in things around us. But the light that can be detected by the naked eye only accounts for a small part of the entire spectrum. A large amount of invisible light carries information starting from the Big Bang, across distant galaxies, and finally reaches the earth. The better we understand light, the more likely we are to unlock the secrets of how the universe works. In this short book, Professor Walmsley leads us starting from the weird properties of light, along the history of human understanding and use of light, and finally reaching the field of quantum optics. Open this book and you will understand the secrets of everything in the universe contained in light.
