Double slit interference: moving waves

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SUMMARY

The discussion centers on the double slit experiment and the nature of interference patterns created by coherent light sources, such as lasers. It is established that the interference pattern consists of standing waves due to the equal distance from the slits to the screen, resulting in constructive and destructive interference at specific points. The peaks and troughs of the waves from both slits arrive simultaneously at the midpoint, leading to maximum amplitude at that location. The concept of resonating waves is questioned, with emphasis on the role of the screen in displaying the interference pattern.

PREREQUISITES
  • Understanding of wave mechanics
  • Familiarity with the double slit experiment
  • Knowledge of constructive and destructive interference
  • Basic principles of coherent light sources, such as lasers
NEXT STEPS
  • Explore the mathematical formulation of wave interference patterns
  • Investigate the role of coherent light in interference experiments
  • Learn about the implications of standing waves in various physical systems
  • Study the effects of varying slit separation on interference patterns
USEFUL FOR

Physics students, educators, and anyone interested in wave phenomena and optical experiments will benefit from this discussion.

PiotrDab
As I understand the double slit experiment, an interference is created on the barrier. Usually the drawing is made as the constructive waves hit the wall perfectly in middle. Let's say the wave has a frequency f, the interference should be moving away from the middle at time t+f/4. Why we don't see that move on the screen? Are they standing waves? if yes, where does the resonating come from? (the screen?)
 
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Because the laser source is equidistant to both slits, the slits are being illuminated in phase.

Using the wave model:
Because the midpoint on the screen is also equidistant to both slits, the "peaks" and "troughs" of the waves arrive at the same time from both slits - so the "add up" in amplitude.
 

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