heres a simple question I somehow couldn't find an answer on the internet. we know radio waves only reflect (significantly) when it strikes an object with size greater than the wavelength, but I'm not sure what exactly defines the "size" of the object. For example, if I were to confine a 1m wavelength wave to a beam of only 0.5 meter diameter, if the beam strikes a 2 meter long, but only 0.1m in diameter rod placed perpendicular to the beam, will the beam reflect. Another way to put it is, when we talk about "size" greater than the wavelength, are we talking about the absolute size, or the size of the surface being exposed to radiation. thanks.