Fact 1: Aprism is used for refracting light.

Fact 2: Light contains energy.

Given the two facts above, answer the question "What is used for refracting energy?" with the following options: 
- wind
 - a circuit
 - a prism
 - Decibels
 - a window
 - glass
 - a doorbell
 - a wave


 

   a prism      