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Are hypotheses concerning the two-slit experiments generally used to demonstrate light as a wave valid?

I refer you to Chapter 4 of The Elegant Universe (but the experiments are in many references).
1. Figure 4.10 showing Feynman’s ‘every possible path’ would seem to fall victim to astute philosophical scrutiny. If each photon could follow every possible path on the source side of the barrier then wouldn’t all photons passing through the slits also be constrained to follow every possible path on the event side of the barrier (in any reducto ad adsurdum) and therefore yield no pattern at all? Due to random distribution wouldn’t the pattern be that of a ‘normal curve’?
2. Is it technically possible to conduct the experiment as shown in Figure 4.8 and have results meaningful on the quantum level considering reflection and refraction caused by the inside edges (the barrier must be thicker than a photon) of the slots on a quantum fluff level, much less considering the effects of the uncertainty principle and unpredictable nature of restricted particles?
Have these experiments been done?


  1. Yes. If you are talking about edge effects that is not done. The bell curve shape is demostrated in a single slit experiment. In double slit is experiments it is a wave form that could not be explained fully. The behaviur of photon is random

  2. these experiments are redone about twice a year (with not as much precition though) in every college in the country.
    (that is if i am getting the right experiment)

  3. Hi. I think the point of Feynman’s explanation is that even though we can detect a single photon (supporting the particle aspect) we also see the interference patter associated with waves (supporting the wave aspect). Although the theory may still be wrong, it fits very well with observations.


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