You are presented with the question "what can a mirror be used to reflect?" and the following answer choices: 
- noble gases
 - air particles
 - glass
 - focusing a lens
 - rays or beams
 - photons
 - sun's heat
 - an electron lens

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


 

     rays or beams    