History of discovery in light and vision continued

Euclid was a greek mathmatician who wrote many things, including works on perspective and on geometry. He described how things get smaller as they get farther away. He also wrote on perfect numbers and prime numbers. His writings showed that perspective is in everyday life and everywhere we look.
Empedocles was a greek philosopher who was best known for his work with four elements. He suggested that everything in the universe was made up of 4 elements; water, air, earth, and fire. The interesting story about him was that he threw himself into a volcano believing that he was immortal. He believed that light traveled in a straight line and at a very high rate of speed.
AlHazen studied optics and made very big contributions to the principles of optics. He wrote the Book of Optics and studied binocular vision. He probably built off of Euclid"s idea of perspective. He also studied how light broke up into different colors and he said that light rays were streams of energy particles traveling in straight lines.
Isaac Newton invented the refracting and reflecting telescope. He developed a theory that a prism decomposes white light to all the colors of the spectrum. He studied refraction and fixed the problems of the refracting telescope by make a reflecting telescope. He said that colored light did not change its properties. He believed that light was a stream of particles just like Alhazen.