What's the mechanism of rainbows? ???
Rainbows can be seen in the spray of a waterfall. Ideal conditions for rainbows are sunlight and water droplets, usually as rain, but also in fine spray. How is a rainbow formed? The mechanics of rainbows have been studied since ancient times. The Greek philosophers were aware of the role of reflection in forming a rainbow, and had some understanding of the role of refraction. In the 13th century, scientists produced theories on rainbow formation, and in the 17th century, Rene Descartes sketched out the conditions required to observe a rainbow.
