Light

Light is a kind of electromagnetic radiation. It is made up of vibrations between a certain group of frequencies. When light is given off from a source it spreads out over a larger area. Scientists are still dumbfounded by exactly what light is. When light hits a smooth or polished surface it "bounces" off at the same angle that it hit. Reflecting telescopes are made of concave mirrors and they have helped astronomers chart the …

…it hit, if the mirror is flat (which most are). Another thing that can interrupt the travel of a light ray is a denser material than it was already in. This is called refraction, which is the bending of light. Prisms and lenses are pieces of glass that are specially designed to refract light rays and put them to use. Light can be mysterious in many ways, but in other ways it can be useful.