Question

observation of newton disc​

Answer 1

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A Newton disc, invented by IsaacNewton, is a disc with seven segments in rainbow colours. When the disc is rotated, the colors fade to white; In this way Isaac Newton demonstrated that white light is a combination of the seven different colours found in a rainbow.

Answer 2

$74xy35 2 \frac{y3ye \beta eey \times \frac{?}{?} \times \frac{?}{?} }{?} \frac{?}{?}$