Newton’s Color Disc

A Newton disc is a disc with segments in rainbow colours. When the disc is rotated, the colours fade to white; In this way Isaac Newton demonstrated that white light is a combination of the seven different colours found in a rainbow. A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision. It can easily be made at home using a card board piece It was an important discovery as it proves that light is not colourless, but has colour in it which together converge to give a faded white colour which we consider colourless. It was made by Isaac Newton. This property is based on the principles of dispersion of light.

It is very easy to make. You will need a CD or a circular cardboard, coloured papers, glue, strong string (not too thin), candle, and a nail. Heat a nail by placing it above a candle and make holes in the disc half an inch from the centre. Insert one end of string in a hole and pass it through the other. Tie a knot at the end. paste the coloured papers as per the VIBGYOR. Rotate it clockwise then pull. After some practice you will be able to see a shade of white.

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