Fact 1: Aprism is used for refracting light.

Fact 2: Prism A prism is a solid geometric shape.

Given the two facts above, answer the question "What is used for refracting light?" with the following options: 
- barrel-shaped
 - fissures of hot, acidic water
 - an electron lens
 - focusing a lens
 - degrees Celsius
 - Electrical energy
 - A solid geometric shape
 - A Greek letter


 

       A solid geometric shape  