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@NotThamesWater
Light / energy / matter can act as particles and as waves - At difference energies, there are different levels of interaction.
Visible light (in the 400 - 700 nm range) will bounce of / be absorbed by matter, like a wave hitting a wall.
Smaller wavelengths (x-rays, for example, at 0.1 to 10 nm) may pass through.
String theory makes it even more complicated though, as does quantum mechanics, and the fact that matter is not empty space - atoms are not quite the mini solar systems that we know from school, but bundled up energy probability densities.