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The discovery of prisms.
Jul 02, 2018

Newton discovered the phenomenon of light dispersion in 1666, and the Chinese were also ahead of the foreigners in this respect. In the 10th century AD, the Chinese called the natural transparent crystals after sun exposure “The Stone of Five Lights” or “The Stone of Light”. It is the earliest cognition of the dispersive phenomenon of light in the world that it regards "sunshine as a matter of five colors, such as rainbow," and it shows that people have liberated the phenomenon of dispersion of light from the mystery, knowing that it is a natural phenomenon. This is a major advancement in the understanding of light. Newton separated the sunlight into seven colors through the prisms, indicating that the white light was formed by the seven-color light compounding seven hundred years ago.