Figure (a) shows a triangle representing a prism and a pure wavelength of incident light falling onto it and getting refracted at both sides of the prism. The refracted ray runs parallel to the base of the prism and then emerges after getting refracted from the other surface. Figure (b) shows a triangle representing a prism and an incident white light falling onto it and getting refracted at the first surface with two refracted rays with slightly different angles of separation. The refracted rays, on falling on the second surface, refract with various angles of refraction. A sequence of red to violet is produced when light emerges out of the prism. Red at 760 nanometers and violet at 380 nanometers.
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