How can you explain the results of experiments with the passage of electromagnetic waves through a system of two metal lattices?

When the vector of the electric field strength in the electromagnetic wave is oriented parallel to the metal rods, forced oscillations of free electrons are excited in them and the wave is reflected. When the vector of the electric field strength is oriented perpendicular to the rods, the forced vibrations have a lower amplitude, since the electrons vibrate across the rods.

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