GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Refractive index and refraction angle in a glass are dependent on the wavelength. Hence a glass prism can be used to disperse (decompose) light into different wavelengths (colours). In this digital composite red, green and blue overlapping laser beams are incident on a glass prism. Together, they are perceived by the eye as a single white beam (top left). After refraction in the prism the three colours are spatially separated.
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