LAWRENCE LAWRY / SCIENCE PHOTO LIBRARY LAWRENCE LAWRY / SCIENCE PHOTO LIBRARY
Refraction. White light being refracted as it passes through a triangular prism to produce a spectrum (rainbow, across centre). 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.
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