Prism with colour spectrum, illustration. A ray of white light from a ray box (left) strikes the triangular prism, refracting onto the right hand face. At this face, the light is refracted again, exiting the prism and forming the colour spectrum projected onto a screen (right). The spectrum is a result of the different amounts of refraction of the different wavelengths found in white light, resolving it into its component colours. This is a version of an experiment by Isaac Newton showing light to be composed of a range of different colours.