The rainbow would look the same as it does now. That's assuming that the sun is still producing a full spectrum of light, which to the best of my knowledge all stars do. The color you see is often due to atmospheric interactions, in addition to the wavelengths being emitted by the sun. Now if the sun were ONLY outputting light of a blue wavelength....you wouldn't have a rainbow, it would just be blue light. The way a rainbow works is the water droplets in the air cause dispersion, which is the effect by which different wavelengths of light are refracted at different angles, thus creating the separation of colors that we see in a rainbow. So if a particular wavelength of light, say blue, were not present in the light that is hitting that water droplet, you wouldn't see any blue light in a rainbow that may be formed.
11 Jan 2013, 9:27 pm
