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 "Glass causes the _ of light" with the following options: 
- intensification
 - bending
 - photons
 - a wave
 - Pollution
 - blocking
 - heat
 - amplification


 

  bending       