Britannica Educational Publishing 
Light [PDF ebook] 

Our visual experience of the world and our ability to perceive the objects and people around us would be impossible without light and the many roles it plays in our daily lives. In addition to facilitating our perception, light sustains life on earth by providing energy to plants and heating the atmosphere. The fundamentals of light-including how it is measured, its interaction with matter, and the particle and wave theories of light-are covered in this detailed volume.