The phenomenon of dispersion proves that:

white light is made up of seven constituent colours

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light moves in a straight line

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light passes through a transparent medium

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light does not pass through an opaque medium and absence of light causes shadow

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Solution

The correct option is A white light is made up of seven constituent colours
The splitting of white light into its constituent colours as it passes through a refracting medium (such as prism) is known as dispersion. The phenomenon of dispersion shows that white light is made up of seven constituent colours.

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