the mass to penetrate is substantially less in the foil, yet it blocks all frequencies up to xraysyet visible light and radiowaves have almost zero loss.
Lots of free, conduction band electrons to interact with the photons and in general electron orbitals which can absorb some light, tooAir is mostly N2 and O2, which lack the dipole moments needed and don't interact with visible light (they do with UV.) Free electrons pretty much can interact with anythingAdd oxygen to your aluminum to get sapphireThen it passes light againAnd doesn't have all those conduction band electrons.
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