You are presented with the question "What aspect of light changes when it passes from air into a prism?" and the following answer choices: 
- power
 - seasons
 - speed
 - energy
 - a wave
 - Joules
 - heat
 - unique

Now knowing that aprism is used for refracting light and refraction is the bending of light cause by a speed change when it passes through different media, choose the best answer.


 

   speed      