You are presented with the quiz "What can form a rainbow?" 

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 "when the light waves strike a prism, the rays of light refract, or bend, at different angles". 

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


 

    A prism       