Thank you Rob =D I totally understand now. You explained it perfectly. I was just unsure how light travelled through a denser medium. Also thank's for explaining why a light beam doesn't completely scatter on impact with the medium i had a feeling it may have had something to do with the initial direction.
And can i can get rid of this whole concept of light travelling 'slower' and just imagine a photon (on average) taking longer to pass through the medium because it is absorbed and emitted with a time lapse? Denser material, more absorbtion and emitting per cubed unit, apparent decrease in velocity?
Thanks Rob and to everyone else =]
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