PDF chapter test TRY NOW
- Take a circular cardboard disc of about \(10\ cm\) diameter.
- Divide this disc into seven segments.
- Paint the seven rainbow colours on these segments.
- You can also paste, coloured papers on these segments.
- Make a small hole at the centre of the disc.
- Fix the disc loosely on the tip of a refill of a ball pen.
- Ensure that the disc rotates freely.
- Rotate the disc in the daylight.
What happens when the disc in rotated?
When the disc is rotated freely at high speed, all seven colours get mixed and appears . This type of disc is known as .
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