The Cause of Rainbow

For centuries, the cause of rainbow is interesting to talk by scientists or non-scientists. The natural phenomenon, rainbow which has been enjoyed by nearly all people seems simple. In fact, it is quite complicated to analyze. The phenomenon which attracts hearts of many people happens because sunbeam is refracted by water droplets while the water droplets itself exists in air because rain has just fallen or water of earth surface evaporates. We can see many spectrums of colors in rainbow because in fact, white sunbeam is polychromatic color. After refraction, the white polychromatic spectrum becomes several colorful monochromatic spectrums. In short, when there is water droplets, it is possible to see rainbow. Therefore, we usually see rainbow at the time rain stops falling.