Newton's colour disc is made by painting the constituent colours of white light in the same order and proportion. In which colour the disc appear when rotated very fast?

White

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Black

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Blue

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Red

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Solution

The correct option is A White
White light is made up of 7 constituent colours (VIBGYOR). When these colours are mixed in proper order and proportion, they form a white colour.
Persistence of vision is the sensation of seeing an object for about $\frac{1}{16}$ second even after the image is removed from view.
So, by the phenomenon of persistence of vision, the disc appears white when rotated very fast.

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A disc is painted as in the figure below. It is rotated very fast as indicated by the direction of the arrow. What will be the colour of the disc?

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A disc in which seven rainbow colours equally spread over an area, which on rotation, fades to white colour is called:

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