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How can you prove that white light is a ...

How can you prove that white light is a mixture of all colours ?

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1) Take a prism.
2) Send white light through the prism.
3) Dispersion of light takes place.
4) light split into seven colour (VIBGYOR).
5) It appears as a rainbow on the screen or wall.
6) In this way we can prove that white light is a mixture of all colours.
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