Please share any good links you've got, or write your own if you're up for it. Thanks comrade o7
Here is the one on Wikipedia https://en.wikipedia.org/wiki/Refractive_index#Microscopic_explanation
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This might be a good lead https://en.wikipedia.org/wiki/Ewald%E2%80%93Oseen_extinction_theorem
*some more detailed discussions referenced in the wikipedia article above:
https://sci-hubtw.hkvisa.net/10.1017/CBO9780511803796.019
https://sci-hubtw.hkvisa.net/10.1119/1.19330
https://sci-hubtw.hkvisa.net/10.1119/1.18315
I'm working my way through but I'm tired and might have to move on to study other topics