a ray of white light is dispered by a prism. Why ?
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Explanation:
The refractive index of many materials (such as glass) varies with the wavelength or color of the light used, a phenomenon known as dispersion. This causes light of different colors to be refracted differently and to leave the prism at different angles, creating an effect similar to a rainbow.
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The main cause of dispersion of light is due to the extent of refraction of light for each constituent color of white light. We know that the speed of light remains constant in the vacuum but it changes when the light passes through different materials of different refractive index.
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