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Originally Posted by HIGGSBOSONS Sorry Guille I Did'nt Pick Your Point |
I'm not ideal at explaining physics, but I'll try easier now. A photon is energy and carries a certain amount of energy, which is not variable. It's 'proper' speed is 300,00km/s in vacuum. In mediums, the speed is less always than the proper speed, and it's value depends on the density of particles in it. If light goes through a very dense medium, it's speed lowers down. The energy it carries is the same, but there is more resistance to it as there is a bigger density of particles. When light goes from the very dense medium into a less dense medium, it goes faster. The energy it carries is still the same as always, but as there is less resistance from particles (for there is less density of particles), then it rises it's speed. But not that it accelerate.