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When white light passes through a glass prism, its constituent colours (VIBGYOR) travel with different speeds in the prism.

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All the colours are refracted by different amounts

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Red colour has more wave lenghth so it will deviate less.
Blue colour has less wave lengh so it will deviate more.

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Any light that is composed of more than one colour is called composite light.

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Any light that is composed of more than one colour is called composite light.

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Examples: sunlight, white light

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When a sunlight is passed through a prism it will split into seven constituent colours.