How can you be sure it's not the glass (medium) that interacts with the light?
You are the dumbest person in the world. Sorry, but you are.
If it was just the glass..........your vision would end with the glass. You wouldn't see what is on the other side.
Pull your head out of scepti's ass.
No, dick head, you and your round earth cronies are the ridiculously naive sheep that willingly walk forward to the cull.
Earthisaspaceship is clued up...something that most of you don't even know the meaning of the word.
It's worrying, it really is.
Bark all you want, you prat, but all you are, is a mental mainstream follower that believes that memorising bull crap, makes you intelligent. lol