Images, Resonances, Echoes, take 9

Photons are finally here. Who knew such a slow arrival was possible? Maybe COVID tunnelling is a phenomenon after all or at least COVID-induced lassitude. Introspection suggests the latter, unreliable as it is. Topics around light are typically taught by a mixture of assertions about light and waves and use of ray diagrams to make predictions. I suggest that a radical overhaul would improve matters.

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