Why Does Light Slow Down in Glass?

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SUMMARY

Light travels slower in glass due to its interaction with the atomic structure of the medium. When light enters glass, it induces oscillations in the atoms, which in turn emit secondary waves that interfere with the original light wave, effectively slowing it down. Upon exiting the glass and returning to a vacuum, light resumes its speed at C, the speed of light in a vacuum, without violating the principles of relativity. The energy dynamics involved do not imply a loss of energy but rather a temporary alteration in the propagation speed due to the medium's properties.

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Light Slower In Glass ??

so light is slower in glass, but why

i know its something about that when a wave of light hits atoms the move around and produces more waves of light and then the super position of them then slows the original light somehow, but i don't understand why and how

and then is light slows down when it's traveling in a medium and its traveling at C when it come out of the medium and into vacuum, then the wave or foton somehow lost energy when it came in, but how does it regain that energy and if it was slowed down to under C and then accelerated to C aigen dosent that break realativity
i mean a foton or light wave have energy and e^2=m^ 2c ^4+p^2*c^2 så vil den også være påviket af realativitets theorien


i know its a stupid question but i just don't understand
and surry for my bad english
 
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See also this post:

https://www.physicsforums.com/showthread.php?t=511177

from the Frequently Asked Physics Questions section of our General Physics forum.
 
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