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Caption: Refraction. White light being refracted as it passes through a triangular prism to produce a spectrum (rainbow). Refraction is the change of direction of a wave when it passes from one medium to another at an angle. Different colours of light have different wavelengths. The white light is split into a spectrum because the amount of refraction varies with the wavelength.


Keywords: beam, beams, colours, light, optical, optics, physics, prism, rainbow, ray, rays, refracting, refraction, spectrum, split, splitting, triangular, vertical
