What is meant by spectrum of white light? How can we recombine the components of white light after a prism has separated them?
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Since the wavelength of red colour is maximum in the visible light, the light of red colour is scattered least by the air molecules of the atmosphere and therefore it can reach to a longer distance. Thus, from a longer distance this red danger sign can be detected without much scattering
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When white light comes out of the prism, light is spread in a fan shaped beam. This fan shaped beam is termed as a spectrum. Light is said to be dispersed into a spectrum consisting of violet, indigo, blue, green, yellow, orange and red.
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