Fact 1: Glass cause refraction of light.

Fact 2: Mirrors are plate glass.

Given the two facts above, answer the question "Mirrors cause" with the following options: 
- heat energy
 - direct energy
 - depletion of light
 - inspection of light
 - flow of electrons
 - refraction of light
 - optical illusions
 - The area was once underwater


 

      refraction of light   