>> At this point we’re just reinventing photons. Or is it another case of "wave function collapse"? Remember that diffraction grating work too, and they rely o

>> At this point we’re just reinventing photons. Or is it another case of "wave function collapse"? Remember that diffraction grating work too, and they rely on the wave nature of light. It is sometimes said (and can be modeled) that light takes every path from source to destination and the diffraction grating causes many paths to cancel out so it appears to go specific ways. Mirror reflection can also be modeled this way, and making periodic scratches will turn it into a diffraction grating. In the end, a photon detection is like a "measurement" that collapses the reflected wave function. Photons are never observed "in flight" they are only detected when they hit something. In between they may as well BE a wave function.