Answer the following question: Fact 1: Arainbow is formed by refraction of light by separating light into all different colors. Fact 2: Light rays come in through the lens. Given the two facts above, a rainbow is formed by what of rays?

Select from: 1. an electron microscope; 2. energy of moving objects; 3. heat energy; 4. Solar energy; 5. rain or sun shine; 6. separation of colors; 7. sun's heat; 8. flow of electrons;
Answer:
6.