Fact 1: Amirror is used for reflecting light.

Fact 2: Light seems to travel in rays or beams.

Given the two facts above, answer the question "what can a mirror be used to reflect?" with the following options: 
- noble gases
 - air particles
 - glass
 - focusing a lens
 - rays or beams
 - photons
 - sun's heat
 - an electron lens


 

     rays or beams    