Which scientist discovered the phenomenon of dispersion? What year was that?

In 1666, Isaac Newton drew attention to the iridescent color of stars in a telescope. Trying to explain this phenomenon, he conducted an experiment. Newton in his experiments used sunlight, which he passed through a narrow opening in a window shutter through a prism. The light disintegrated into all colors of the rainbow. So he discovered that white light consists of many colors mixed with each other.

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