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Consumer Electronics by S. P. Bali

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DISPERSION AND RECOMBINATION OF LIGHT

If a stream of sunlight is made to pass through a small circular hole in one of the shutters, it will make a small circular patch on the opposite wall. On placing a triangular prism before the hole, an elongated coloured patch of light will be formed on the wall. This is called the spectrum of light. The colours formed are in the order shown in Fig. 31.1

 

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Fig. 31.1 Dispersion of light

 

White light consists of a mixture of seven different colours. The refractive index of glass is different for each colour, so that when white light falls on the prism, each colour in it is refracted at a different angle, ...

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