|
Light travels at the speed of light in a vacuum , but in other mediums it slows down, hence it is bent to form nuddy pics.
But this is the bit I don't understand, after it comes out off glass where does the energy come from for it to speed up again to "light speed" ?
How is possible for it to be slowing down and speeding up?
Or is it always traveling at the same speed but glass is like a windy road ?
|