What is Slit: Definition and 1000 Discussions

A slit lamp is an instrument consisting of a high-intensity light source that can be focused to shine a thin sheet of light into the eye. It is used in conjunction with a biomicroscope. The lamp facilitates an examination of the anterior segment and posterior segment of the human eye, which includes the eyelid, sclera, conjunctiva, iris, natural crystalline lens, and cornea. The binocular slit-lamp examination provides a stereoscopic magnified view of the eye structures in detail, enabling anatomical diagnoses to be made for a variety of eye conditions. A second, hand-held lens is used to examine the retina.

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  1. H

    B What is the pattern in a double slit experiment near the slits?

    I am looking to this picture https://en.wikipedia.org/wiki/De_Broglie%E2%80%93Bohm_theory#Double-slit_experiment it seems that fringes only appear on a screen when it is not too close to the fringes. and that the electron near the screen would give a pattern as when the path is known. Is it right?
  2. C

    I Two slit experiment with different sized slits

    If the two slit experiment is performed with one slit half the width -- or 1% or 0.1% the width -- of the other, how is the interference pattern affected.
  3. S

    B Double Slit Paradox: A Wave-Particle Mystery

    Let's take a pair of particles A and B that are in a quantum entanglement state, and shoot them in different directions. Along the way, one of them will pass in the famous screen of the two slits, say B. According to the known experiment, if we put a detector in one of the slits, we will lose...
  4. tanaygupta2000

    Young's double slit experiment

    Since slit-2 = 4 × (slit-1) Hence amplitude, a2 = 4a1 which gives i2 = 16×i1 So i(max) = i2 + i1 = 16i1 + i1 = 17i1 & i(min) = i2 - i1 = 16i1 - i1 = 15i1 => i(min) /i(max) = 15/17 but there's no such option. Kindly help me to figure out where am I doing error.
  5. wolfy

    B Has the Double Slit Experiment been Performed in a Near Vacuum?

    Where, When and Who has performed the Double Slit Experiment in a Near Vacuum Environment Cannot find it anywhere on Line Thank You
  6. S

    I Young's double slit experiment -- Question about this wavefront diagram

    Hello, I have a question about the blue waves coming from sources S1 and S2 in de next picture. The blue waves from sources S1 and S2, are those two resulting waves (interference of all wavelets, Huygens Principle) or are those blue waves two wavelets?
  7. hairey94

    Diffraction of Light (Single Slit)

    My initial guess... Third dark fringe is 2nd order dark fringe and second bright fringe is 1st order bright fringe. Is this the correct guess?
  8. J

    I Double Slit Experiment Question

    I'm wondering if this would be a way to interpret the double slit experiment. In other words, when we observe an electron in the present, it goes through one slit or the other as a particle. However, if we do not observe it, it goes through both at once as a wave; we only see evidence of it...
  9. David Charles

    I Double Slit Interference Question II

    A stream of photons pass through a double-slit. The photon stream emerging from each slit then passes through a crystal which splits each photon into coherent entangled pairs. One photon from each pair heads towards a detector (D0) that "can be scanned by a step motor along its x-axis for the...
  10. David Charles

    I Double Slit Interference Question

    A laser provides a constant stream of photons which pass through a double-slit. The photon stream emerging from each slit then passes through a crystal which splits each photon into coherent entangled pairs. One photon from each pair heads towards a photosensitive screen and the entangled twin...
  11. B

    Finding the distance between slits in double slit experiment

    Hi so I have been struggling on a part of a question that I'm not too sure on how to solve For some reason PF is not allowing me to pose an image of the question on here so I have provided a link to it Question link: And here is what I tried to do so far, I drew a sketch of a diagram to help...
  12. sincosine

    Young's double slit equation problem

    Hello guys i have one problem and i can't find right solution. In some notebooks for destructive interference it says Δx=(2k+1)*λ/2, and it doesn't make sense for me because if i insert k=1 it will be 3λ/2 and it should be λ/2. And also for light diffraction d/2sinθ =λ/2, this one is correct...
  13. A

    Number of maxima in Young's double slit experiment

    I honestly do not have any idea regarding this sum. Any help will be appreciated:)
  14. T

    I Single Photon Double Slit Experiment

    We're told that single photons passing through a double slit produce an interference pattern, but the act of observing which slit the photon passes through causes the interference pattern to show a simple ballistic pattern instead. But observing which slit the photon passes through necessitates...
  15. Davephaelon

    I Single photon double slit experiment

    My question is does the photon that is absorbed by an atom on the detection screen have exactly the same energy as the photon that left the 'gun' source? Hence, does the wave packet representing a photon lose some of its energy when it impinges on the double slit barrier, so that when the...
  16. Y

    Diffraction, interference, single and double slit setups

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  17. garthenar

    Intensity and Interference Patterns (double slit)

    I'm still on part a. I think that i may have the wrong equation for intensity. I'm not sure I'm using the right numbers for the "first minimum". I started with getting the wavelength λ=(ax)/D since the first minimum occurs at m = 0.5 I multiplied the distance to the first minimum by 2 to get...
  18. F

    B Order of a dark fringe in Young's double slit experiment

    So the angular position for constructive fringes is d \sin \theta = m \lambda = (2m) \frac{\lambda}{2}, \qquad m=0, \pm 1, \pm 2, \ldots whereas for destructive fringes we have d \sin \theta = m \lambda = (2m+1) \frac{\lambda}{2}, \qquad m=0, \pm 1, \pm 2, \ldots I can see that ##m##...
  19. Marcin

    I Time measurement in a double slit experiment with single photons

    Assumption: Screen detector is much closer to the slits than in "standard experiment" and the small angle approximation can't be used to determine the interference fringe maxima, but the interference pattern still occurs. Is it possible to measure the time of detection in such setup accurately...
  20. Marcin

    Double slit experiment with magnetic traps

    1. Is it possible to perform the following, modified double-slit experiment with single electrons/electron beam: The slits are separated in such a way, that each leads to a separate magnetic trap. The traps have oppositely directed magnetic fields, so that the electrons entering them move in...
  21. L

    B How does the double slit experimental apparatus actually work?

    So when explaining the results of quantum double slit experiments that have evolved from the classical wave double slit experiment, popular lecturers of quantum mechanics often show an animation of an electron gun or photon source shooting a lot of particles towards a double slit. The effect is...
  22. UnderstandingQT

    B Questions about measurement devices in the double slit experiment

    How did you find PF?: Google Is it true that the devices that quantify which slit do NOT produce wave collapse unless they actually record the light measurements rather than just detect them without recording?
  23. D

    B How does the observed version of the double slit get by without math?

    Send a classical particle into a three dimensional potential well. 0 Probability of it tunneling. It's a classical trajectory with wobble from uncertainty. It's not a wave, but gets wobble from the quantum field influencing it. https://farside.ph.utexas.edu/teaching/315/Waveshtml/node95.html...
  24. L

    How can a single slit diffraction create an interference pattern?

    I explained that Huygens principle states that each point on the wave front act as a point source which produces spherical waves which produce the interference pattern. Now his question is that where are these points and wouldn't there be infinite number of points on each wave front creating...
  25. F

    I Why Won't Observation in a 2 Slit Experiment Cause 1 Slit Diffraction?

    From what I understand, if the two-slit experiment is performed while observing a slit for particles, two distinct bands appear rather than interfering. This is a little confusing, as, from what I understand, diffraction is caused by measuring a particle's position (i.e. using a slit to narrow...
  26. C

    B Detecting a photon passing through a slit without destroying it?

    I cannot see how a photon can be detected and yet remain the same photon. I am thinking that the description "If a detector is place at each slit so that we know which slit the photon passsed through, the interefence patten does not form" is sloppy and in error.
  27. Spinnor

    I Photon Double Slit Experiment: Visualizing the Guiding Field

    Does the following picture which I think shows the guiding field for electron in the double slit experiment have a corresponding image when the experiment is done with photons? Thanks for any help.
  28. E

    Young's experiment - lowering the light intensity of one slit

    I think that what happens is that the amplitude becomes sqrt(2)/2A in the slit filtered, as opposed to A in the other slit. I suppose we will still get constructive interference from the slits, so the value (1+sqrt(2)/2)A will be reached as opposed to 2A in the usual experiment. However, the...
  29. S

    Wavelength used in double slit experiment

    m × lambda for bright = (m - 1/2) × lambda for dark so: 2 × 708 = 2.5 × second lambda Second lambda = 566.4 nm But the answer is 495 nm. Where is my mistake? Thanks
  30. C

    Young's double slit experiment

    I know that ydse is based on interference of light when it passes through an obstacle having almost same aperture as the wavelength of light. Also they should be coherent to have a constant phase difference at every point. But I don't get why the light beams should be parallel?
  31. jisbon

    Finding Angles in a Double slit experiment

    Hello all! Having some problems understanding this question. From what I know, bright fringes means that there will be constructive interferences, whereby ##d\sin \theta =m\lambda## In this case, I know the d (separation of silts). However, what should I put in for wavelength? I went through...
  32. Z

    I Double slit mystery in relation to holography and the single slit?

    What part of double slit mystery remains considering single slit can produce interference pattern as well? Does holography not fully explain those patterns behind any number of slits as a sort of "encoded image" of the slit(s)? Does the word "focus" have any meaning in these kinds of experiments?
  33. D

    I Can Different Shapes of Slits Affect the Diffraction Pattern of Single Photons?

    What I've seen of the experiment involves sending a stream of particles through the slits. I'm extrapolating when I say that the interference pattern could be caused by electromagnetic fields (in the case of massive particles), especially because the particles are moving and probably spinning as...
  34. S

    Distance between light source and slits in the double slit

    Hi, Does the distance between the light source and the slits matter? Does the interference pattern change if you move the light source closer or further from the slits? I read from this link that the collimation of the light changes with distance and that affects the interference pattern...
  35. N

    Exploring the Symmetry of the Double Slit Experiment

    I have no clue how to answer this question. I would imagine for (a) that half of the probability of total particles goes away with only one slit.
  36. entropy1

    I How Does a Photon Know Which Slit to Pass Through in a Double Slit Experiment?

    Suppose we have a double slit and we fire a photon through it with no photon detector at either slit. We get a interference pattern. Now we put a photon detector at the left slit. The interference pattern is destroyed, right? In this last setup, the photon can be located at the left slit. So...
  37. D

    Double slit: ratio of intensity of 3rd- and 0th-order maxima

    Homework Statement: In a double slit experiment let d=5.00 D=30.0λ. Estimate the ratio of the intensity of the third order maximum with that of the zero-order maximum. Homework Equations: interference diffraction i guess the goal is this equation ##I_{(\theta)}=I_0 \times(cos^2\beta)\times...
  38. H

    I How to collapse a water wave through a double slit into particle behaviour?

    Electrons passing through a double slit is in a superposition of passing through the left slit and the right slit, thereby producing an interference pattern on the screen. But when a detector is placed to detect which slit the electrons pass through, the interference pattern is destroyed. How...
  39. M

    I Double Slit Experiment question

    I read in a book the following assertion. In a double slit experiment photons are passed through the slits and detected at the end plate. Each of the two slits has a quarter wave plate which alters the polarization of the photons that pass through it in a way different than the other QWP. Thus a...
  40. DARKSYDE

    B Cherenkov radiation double slit experiment

    If a double slit experiment utilized photons from Cherenkov radiation under water, Would we expect the same results?
  41. Iskak

    Double slit experiment wavelength of light used

    0.8m -> 800mm λ = (0.4mm*1.1mm)/800mm = 0,00055mm is it right? I am past that 3 months ago, forgot how to solve.
  42. M

    B Double Slit Wave Interference With Single Electrons

    I have heard that wavelike interference patterns are observed in the double slit experiment even when electrons are fired one by one. https://physicsworld.com/a/the-double-slit-experiment/ My knowledge on the experimental setup is very basic. The reason I am posting here is out of curiosity...
  43. Marilyn67

    A Influence of strong measurements in a Two Slit Interferometer

    Hello, I am interested in weak measures since I discovered this paper: https://arxiv.org/ftp/arxiv/papers/1206/1206.6224.pdf I understood that retro-causality is only an interpretation and that's not more exploitable than the famous experiments of quantum gum delayed choice. In fact, we...
  44. S

    B My particle simulation version of the Double Slit experiment

    I created this in java just a while ago.
  45. S

    B Double Slit experiment and the path of least Action

    Using the principle of least action can you figure out which path the photon took, or which slit it went thru given some initial condition. Or is this not possible and why.
  46. B

    Question about Young's double slit equation

    im assuming the double slit can also be used in the diffraction grating equation. Would the number of lines per meter aka the d value be 1/2 for example in this case also? If both were in one meter.
  47. S

    B Double Slit Experiment with a Medium in front of the slits

    Hi, I was wondering what would happen with the interference pattern if I had a medium with higher refractive index than air in front of the slits. Would the interference fringes become narrower?
  48. S

    B Variations of the Double Slit?

    My first post, and my apologies to any real physicists lurking around. I am a lay person. Senario: * Detectors are turned on, thus interacting with the photons as they pass through the slits; * Recorders are turned off, and no record of which way data exists to be observed. Do we get an...
  49. A. Neumaier

    I The double slit in the thermal interpretation

    I prefer to discuss in the double-slit experiment light in place of electrons since it makes the underlying principle more clear. Consider the quantum system consisting of the screen and an external (classical) electromagnetic field. This a very good approximation to many experiments, in...
  50. S

    Bohmian Trajectories with New Slit

    Hi, I've seen these depictions of Bohmian trajectories and I was wondering what would happen to these trajectories once another slit is opened. Do they get "reconfigured"? Do they all change and adapt to accommodate the trajectories coming from the newly opened slit?
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