The document provides information about the history and nature of light. It discusses early theories from Ptolemy, Aristotle, and others that light travels in straight lines or as particles. The wave theory of light was proposed by Huygens and Young showed it exhibited properties of waves. Maxwell showed light was an electromagnetic wave, while Planck and Einstein contributed the quantum theory explaining its particle-like properties. The document also covers the electromagnetic spectrum, reflection of light, and infographics about properties of planets in the solar system.