Portal talk:Physics/Selected article/Week May 2008

I can understand how light is supposed to slow down when passing throughn refractive media like maybe a diamond crystal. What I dont understand is how it is able to speed back up after it exits the media. How about the possibility that the path through the media is zigzag and thus longer? WFPMWFPM (talk) 13:56, 2 May 2008 (UTC)