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

Nav
Messages
37
Reaction score
1
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?
 
Physics news on Phys.org
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.
 
  • Like
Likes bhobba

Thread 'Quantum Entanglement is a Kinematic Fact, not a Dynamical Effect'

Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
View full post »

Thread 'Quantum behaviour of an electron around a positively charged sphere'

If we release an electron around a positively charged sphere, the initial state of electron is a linear combination of Hydrogen-like states. According to quantum mechanics, evolution of time would not change this initial state because the potential is time independent. However, classically we expect the electron to collide with the sphere. So, it seems that the quantum and classics predict different behaviours!
View full post »

Thread 'Does a qubit break interference in the double slit experiment?'

According to recent podcast between Jacob Barandes and Sean Carroll, Barandes claims that putting a sensitive qubit near one of the slits of a double slit interference experiment is sufficient to break the interference pattern. Here are his words from the official transcript: Is that true? Caveats I see: The qubit is a quantum object, so if the particle was in a superposition of up and down, the qubit can be in a superposition too. Measuring the qubit in an orthogonal direction might...
View full post »

Similar threads

I Why is there no single slit interference when one slit is closed in a double slit experiment?
2
Replies
55
Views
4K
B Double-slit with movable detector screen
Replies
15
Views
984
B Disappearance of interference pattern in double slit
Replies
12
Views
1K
I Why do orthogonal polarizers at slits eliminate interference pattern?
Replies
28
Views
2K
B What is causing destructive interference in double slit experiment?
Replies
32
Views
4K
I Double slit experiment with observer
Replies
14
Views
3K
B Yet another double slit thought experiment...
Replies
20
Views
2K
I Is it possible for a BBO crystal to produce an interference pattern?
Replies
1
Views
2K
I A question about density matricies
Replies
7
Views
365
I Please help me understand the double slit experiment and conclusion
2
Replies
65
Views
3K

Hot Threads

Recent Insights

Back
Top