Here is something that you might remember from your high school earth science class: As sunlight — which appears to be pure white — passes through a glass prism, it refracts or bends. Different wavelengths of light are bent by different amounts. In this way a prism can spread out a ray of white light into the rainbow spectrum.
The spread of refractive colors can be observed in poor-quality binoculars and telescopes. In such inexpensive instruments the optics tend to be not aligned properly so sometimes you'll see the full moon appearing with a yellow-orange tinge on one side and a bluish tinge on the opposite side.
