Greek Language And Alphabets

Greek Original Optical Module

In the fifth century BCE, Empedocles postulated that everything was composed of four elements; fire, air, earth and water. He believed that Aphrodite made the human eye out of the four elements and that she lit the fire in the eye which shone out from the eye making sight possible. If this were true, then one could see during the night just as well as during the day, so Empedocles postulated. Overview began with the development of by the and, followed by theories on light and developed by, and the development of (c. 801–873) was one of the earliest important optical writers in the. In a work known in the west as De radiis stellarum, al-Kindi developed a theory "that everything in the world. emits rays in every direct.