Final answer:
The color on the bottom of a rainbow is violet due to its higher degree of refraction compared to other colors, but when a rainbow is observed from the ground, red appears at the top because of the observer's angle and the nature of the dispersion in raindrops.
Step-by-step explanation:
The color at the bottom of a rainbow that is produced is red. This occurs because the different colors of light are refracted by different amounts when they pass through a medium like a water droplet. In the visible light portion of the electromagnetic spectrum, the colors that bend the most when refracted are violet and blue, which have shorter wavelengths, and therefore higher energy. However, due to the observer's perspective and geometry of rainbows, the red light, which has a longer wavelength and lower energy, is seen higher in the sky, making red the outermost color of the rainbow and hence it is seen at the top when a rainbow is observed from the ground. Conversely, violet light is refracted more than red light, but due to the geometry described, it is seen at the bottom of the rainbow.