You are presented with the question "What is used for refracting light?" and the following answer choices: 
- barrel-shaped
 - fissures of hot, acidic water
 - an electron lens
 - focusing a lens
 - degrees Celsius
 - Electrical energy
 - A solid geometric shape
 - A Greek letter

Now knowing that aprism is used for refracting light and prism A prism is a solid geometric shape, choose the best answer.


 

       A solid geometric shape  