The garage door light explanation really helped, thanks!
Alright, let me try explaining it to see if I understand. Its the medium (air or water) which causes this effect, right? I think it wouldn't matter in a vacuum. The medium deflects photons based on how energetic they are. Its sort of like trying to break down a brick wall. An equivalent amount of kinetic energy in either thousands of baseballs or on speeding 18 wheeler; the 18 wheeler is going to be much more effective.
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