Some of the terms you're looking for to describe electromagnetic effects in crystals such as diamonds include birefringence and anisotropism. In particular to your query, the propogation velocity of light in a crystal depends substantially on the angle of its interaction with the optical axis. Some directions are slower than others - - Otherwise, it would not _look_ like it does!
Mike Sheller :
Get real - - I defy you to produce a modern ( since the dark ages ) textbook that contains that 16th century description of light . . .
Shek :
Quit sending me email asking for my predictions about the "impending Y2K catastrophe." It's like my asking you to predict the number of potential deaths from the newly introduced "Burger King Big King . . ." What's the point?
LGB :
You were right - - _this_ time . . . :- )
All :
I am a GoldBug - - I own call options on June 98 gold, as well as the physical stuff. I will add to my long position as condx improve. I feel something is due to occurr, but don't like to see mumbo-jumbo clouding the perspective. It's hard enough as it is.
Best Regards and Great Trading, Niner
Now I see why you guys post so late: I reply to a post, and by the time I'm through, another post or two has surfaced. I see these of course, and feel obliged to post again, which is what makes it a fun forum.
"Where do electricity & Magnetism come from?" Mike, darned if I know, But I can describe their actions and reactions to a "T" in our existing universe. We may never find out ( especially in our lifetimes ) what the universe is all about, but it doesn't prevent some of us from ( i.e. ) making money in the stock market, or understanding how light behaves. We are simply observers ( I know I've said this before ) , and we have to make the best use of the info we are given in this lifetime.
If you are really interested in the physics of our present reality, try some John Gribbon books, he is a physicist great at explaining where we are today. He takes several unrelated disciplines that would be nigh impossible to keep up with on your own and presents them in a very palatible sense.
Best Regards, Ken
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