Young's Double Slit Experiment : What would happen if the 'first slit' was too wide? The relative phases of the incident waves then sums to give the intensity. As they traverse the double slit, the distances to the screen from each of the double slits is different. It’s all a bit like Plato’s allegory of the cave, where waves are the true reality outside the cave, but particles are the shadows the prisoners inside the cave can weigh and measure, so they mistakenly assume shadows are the only reality.I understand how interference can arise when we start with a coherent light source where all the photons emitted are in phase. We experience the world as something concrete, manifested, objective because all of our information about the world must pass through and enter into our soul’s dissociative boundary, and thus becomes shadows of the vital subjective reality of world mind–what we call our perceptions of the world. When information is inside world or soul mind it can remain quantum, indeterminate, either/neither/both 1 or 0 because thoughts are un-manifested spread-out possibilities (like waves) rather than manifested concrete objects that can be weighed and measured like particles. It must be that information can only pass through dissociative boundaries as discrete numbers, ones or zeroes for example. In my view I speculate that the mechanism that forces this change of representation is the transfer of information from world mind to soul mind. Maybe time isn’t linear or everything happens in the eternal NOW and that somehow time is an artifact of perception? They call this retro-causality and it is controversial because causality is such a basic common sense idea that we find it very hard to believe that reality might have effects preceding causes. It somehow knows whether we are going to get knowledge about it in the future and ensures that it behaves like an un-manifested spread out wave or, if necessary, as a collapsed deterministic particle. So, the light “knows” what is going to happen in the experimental apparatus well before it happens, and light behaves as a wave or photon accordingly. The entangled photons as waves or particles at D0 match up perfectly with what nanoseconds later gets detected at D1 through D4. The strange thing is, whether light acts like a wave or a particle is predicted by entangled photons BEFORE the light has a chance to get transmitted or reflected at the beam splitters. They added a special set of prisms and lenses that produce entangled photons which enter another D0 detector before the later detectors D1 through D4 described earlier. Seeing all this, the physicists got even more clever. How does the light “know” that we are going to learn something about it later and correspondingly change its behavior earlier in time?

So light is a wave until we learn about its trajectory later in time. If the knowledge of which slit the light went through was erased by the clever geometry, then the light remains a wave. If we can know, even after the fact, which slit the light went through, then it will behave like a particle. Somehow this knowledge is equivalent to observation. D3 and D4 each have a 50% chance of detecting light that passed through slit A or slit B and therefore this light behaves as if it was unobserved (as waves).ĭ1 and D2 always detect particles and because of the setup, we know that all the light entering D1 went through slit A, and all the light entering D2 went through slit B. The reason D3 and D4 always detect waves is because we cannot determine which path the beams took, due to the clever geometry of the experiment. Why? This clever experiment tries to remove the observer, but it only manages to shift observation later in time.

As it turns out, the first two detectors above, D1 and D2, always detect impacts consistent with particles, while the second two detectors, D3 and D4, always detect impacts consistent with waves.

Double slit geometry x coordinates