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In the case of a beam of electrons, most of them will flow through a thin surface like foil without any collisions (only a small percentage of the electrons end up colliding with the molecules of the foil), while in the case of a light beam, very few photons will pass through.
Somewhat puzzling given this is the fact what the photons are interacting with is the electrons of the molecules in the foil.
Somewhat puzzling given this is the fact what the photons are interacting with is the electrons of the molecules in the foil.