Question

With the help of Newton’s disc, prove that seven colours of the rainbow can be recombined and produce white light.

June 5, 2024

Answer

Activity:

Take a circular cardboard. Split the disc into seven equal sections.
Colour the first section with violet, the second with indigo, the third with blue, and so on in the order of VIBGYOR in an anticlockwise direction.

Drill a suitable hole in the centre of the disc.
Take a piece of round wood as a spindle. Cut the length as required. Glue the spindle into the hole.

Now, spin the coloured disc very quickly. Your eyes would see all the colours at once and disc would appear to be white.

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