You are presented with the question "what is a prism used to refract?" and the following answer choices: 
- focusing a lens
 - photons
 - h2o
 - glass
 - oxygen
 - rays or beams
 - our nearest star
 - an electron lens

Now knowing that aprism is used for refracting light and light seems to travel in rays or beams, choose the best answer.


 

      rays or beams   