What Is The Cause Of Dispersion Of Light?

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The cause of dispersion of light is due to the different speeds by which the different constituents of light travel in a dense medium.It is also caused due to the different wavelengths of the constituents of light,causing different speeds in the dense medium.
thanked the writer.
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Anonymous commented
This does not explain why different colors of light (energies) travel at different speeds.
Apparently the dielectric constant of glass is different for different photon energies.
Why is that?

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