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Caption: 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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Keywords: beam, colour, conceptual, demonstration, dispersion, education, educational, effect, experiment, geometric, optical, optics, phenomenon, physics, prism, ray, refract, refracted, refraction, scientific, spectral, spectrum, still life, triangular, wavelength, white

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