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White light consist of seven constituent colours. When white light passes through a prism it splits into its constituent colours.
The seven colours of white light are:
Violet.      - V
Indigo.     - I
Blue.        - B
Green.     - G
Yellow.     - Y
Orange.   - O
Red.         - R

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The phenomenon of splitting of white light into its constituent colours through a prism is known as dispersion of light

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Activity showing dispersion of light with water

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Activity showing dispersion of light with water