- #1
johnnyapplese
- 5
- 0
I get that the light changes speed as it enters a material with different densities, however I do not understand why a change in speed would cause a change in direction. For instance if I'm in a car and am going 55mph but slow down to 45mph I'm still going the same direction. It seems the only way for a light beam to change directions is if either the horizontal or vertical components of the light itself change in an uneven quantity.