دانلود کتاب راهنمای اپتیک

We understand the world around us with the help of information reaching our five senseinstruments (organs), namely eyes, ears, nose, tongue and skin. The sense associated with the eyes is known as vision (or sight). Light is the agent which stimulates our sense of sight.The eyes convert the incoming light into electrical signals and convey them to the brain, which after processing the signals causes images or pictures to be created in our mind. We learn about the properties of atoms and their internal structure through the light emitted by them. We learn about the properties of giant stellar systems by means of the light reaching us from them after traveling for millions of years through the empty space. In fact our world is mostly defined by light.