In physics, the pattern of frequencies or wavelengths obtained when electromagnetic radiations are separated into their constituent parts. Visible light is part of the
electromagnetic spectrum and most sources emit waves over a range of wavelengths that can be broken up or dispersed; white light can be separated (for example, using a triangular prism) into red, orange, yellow, green, blue, indigo, and violet. The visible spectrum was first studied by English physicist Isaac
Newton, who showed in 1666 how white light could be broken up into different colours.
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