What makes a rainbow different colors?
Ordinary white light, like that from the sun, is made up of many different colors all of which have a different wavelength. Normally, when we see light from the sun, it appears colorless. However, Isaac Newton discovered in 1666 that when he passed regular sunlight through a prism (basically, a triangular piece of glass), the prism would split the light up into a band of colors. The band of colors is called the spectrum which appears in the order of red, orange, yellow, green, blue, indigo, and violet. When it rains, the air is filled with raindrops. These raindrops act like a prism. If sunlight passes through the raindrops at the proper angle it is split into its spectrum, which is made up of the colors of the rainbow.
