Question

working principle of newton's disc

Answer 1

The Newton disc is a well-known physics experiment with a rotating disc with segments in different colors (usually Newton's primary colors: red, orange, yellow, green, blue, indigo, and violet) appearing as white (or off-white or gray) when it spins very fast.

This type of mix of light stimuli is called temporal optical mixing, a version of additive-averaging mixing.[1]

Many modern sources state that Isaac Newton himself used a disc with colored sectors to demonstrate how white light was actually the compound of the primary colors. However, none seem to refer to a historical source for this.

Ptolemy and Ibn al-Haytham described additive optical mixing with turning wheels and spinning tops hundreds of years before Newton, but they did not use primary colors to get the (off-)white result of the Newton disc.

Transparent variations for magic lantern projection have been produced

Answer 2

Steps of working of newton disc