No interference pattern in double slit when there is a lens?

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SUMMARY

The presence of a convex lens placed far from a double slit experiment disrupts the formation of an interference pattern, resulting in a particle distribution on the detection screen. This phenomenon occurs because the lens alters the phase differences of the photons after they pass through the slits, preventing the coherent wavefronts necessary for interference. The discussion emphasizes that the wave-particle duality concept complicates the understanding of this behavior, as the expected wave patterns do not manifest when the lens is introduced.

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  • Understanding of wave-particle duality in quantum mechanics
  • Familiarity with double slit experiments
  • Knowledge of optical lenses and their effects on light
  • Basic principles of interference patterns
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Why does the interference pattern of the photon go away when one places a convex lens far away from the two slit to only show a particle build up of the two slits?
upload_2015-8-18_11-38-2.png

This is the experimental set up, the lens is in place far after the photons pass through the two slit and hit the back wall in a particle distribution of the two slit, not a wave. Why does this happen?
 
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Nav said:
This is the experimental set up, the lens is in place far after the photons pass through the two slit and hit the back wall in a particle distribution of the two slit, not a wave.
Tthe idea of wave-particle duality just leads to more confusion than clarity here.

Check the phase differences for each point on the screen, and you see why the interference (and even single-slit patterns) disappears.
 
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