Fact 1: Glass cause refraction of light.

Fact 2: Refraction Refraction is the bending of light rays.

Given the two facts above, answer the question "what does glass cause?" with the following options: 
- contamination
 - water vapor
 - coke
 - Pollution
 - chemical changes
 - oxygen
 - lowered energy cost
 - bending light rays


 

        bending light rays 