Question

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

  • light CBSE Class 7
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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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