You are presented with the quiz "A spectrum is formed by refraction of light by separating light into all different what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "arainbow is formed by refraction of light by separating light into all different colors" and "introduction A rainbow is often given as an everyday example of a spectrum". 

So, what's the best answer to the question?


 

      colors     