Then he set up a glass prism so that rays could pass through it. When the rays passed through it, the light refracted into what we now know as the colors of the rainbow. Refraction is the process by which light rays change direction as they pass from one material to another; this is because the rays travel at different speeds through the material, therefore causing the light rays to bend. To confirm that the different colors formed by the refraction of white light was to place another prism behind the original prism, but instead placed it upside down. The different colors of light refract into their original positions, thus gathering into white light. He concluded that white light rays can be further divided into different colors of light. Each light that refracted, even at a slightly different angle, was a different color. To prove that his explanation was scientific, Newton tested his theory with this carefully conducted experiment. Today we consider white light to be the product of different colors, even if we cannot see them directly. Newton was then able to theorize how light is contained in refracting waves and this theory was later explored by many scientists who came after him. One reason why many consider Newton's discoveries difficult to falsify is because we are able to visibly see the