Why does a 90° phase difference in light waves cause slower travel?

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A 90° phase difference in light waves leads to a delay in the emission of light due to energy storage mechanisms in the electrons. When electrons emit light waves that are out of phase with the incoming waves, they temporarily store photon energy, causing the overall light wave to travel more slowly. This storage results in a quarter-wavelength delay, effectively slowing down the light wave. The discussion highlights the relationship between phase differences and light propagation speed. Understanding this phenomenon is crucial for grasping the behavior of light in various mediums.
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I read in a book!If the electrons emit a light wave which is 90° out of phase with the light wave shaking them, it will cause the total light wave to travel more slowly. BUT I don't know why?anybody can help? Thank you!
 
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I assume that you are describing an energy storage mechanism which stores the photon energies and release them a quarter wavelength later.

The light wave will effectively be slowed down by the quarter-wavelength photon storage time.

Is this relevant to the question?
 
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