Slit Definition and 1000 Threads

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. TJung

    B Double slit and DCQE with future prediction

    Tom Campbell posted a series of videos in youtube where he proposes a few variation of double slit and DCQE experiments that might support his theories. He claims that would be possible to predict a future atom decay or a beam splitter behavior that way. I am very interested about experiments...
  2. Davephaelon

    I Double slit experiment with electrons

    When it's desired to detect an electron coming through one of the slits in the mask of the double slit experiment, how exactly is the detection done without blocking the electron from reaching the background screen? In another thread it's mentioned that a semiconductor detector is placed behind...
  3. mkematt96

    Find spacing between slits in a double slit experiement

    Homework Statement 2. Homework Equations I = Imax cos^2 ((2pi/lambda)dsin(theta)) .81Imax = Imax cos^2 ((2pi/lambda)dsin(theta))[/B] To shorten up my work I divided out the Imax 3. The Attempt at a Solution Not sure where I am going wrong. Is the 2.65 deg not the theta I am suppose to...
  4. Cocoleia

    Young's double slit experiment with the source being a slit

    Homework Statement Here i am asked to find the phase difference. Homework EquationsThe Attempt at a Solution I know that usually the equation is mλ=asinΘ
  5. mister mishka

    B Double slit question, rotating polarizers...

    I've wondered about this for sometime, say you rotate one of the polarizers (one of the two covering each slit) slowly from perpendicular to parallel, would the interference pattern slowly come into view?
  6. nso09

    Three slit minima and maxima and path differences

    Homework Statement Find at which angles θ the interference picture that appears on a distant screen made by three thin slits separated by distance d and enlightened by a source of wavelength λ (see figure) a) Shows its maxima. b) Shows its minima. multiple slit diffraction, d, ##\lambda##...
  7. nso09

    Relationship of slit, wavelength, and intensity

    Homework Statement Coherent electromagnetic radiation is sent through a slit of width 0.01 mm. For which of the following wavelengths will there be no points in the diffraction pattern where the intensity is zero? A. Blue light of wavelength ##\lambda=500 nm## B. Infrared light of wavelength...
  8. B

    B Does the Initial Emission in the Double Slit Experiment Have a Trajectory?

    I have 2 questions 1. I'm telling a friend that in the double slit experiment.. the electron has no trajectories between the emission and detection. But she commented the initial emission has trajectory. Is this correct? What is the term for this situation of the initial emission of the...
  9. Y

    B No intensity drop if slit width is negligible in double slit

    In our textbook, it says that the intensity of a double slit interference pattern stays the same if the slit width is negligible. I do not understand this concept. As far as I am concerned, intensity should decrease as the circle of diffraction increase, as intensity is work per area, and the...
  10. chad hale

    I Delayed Choice Double Slit: Sending Info to the Past?

    This is a proposed idea. Using the "Delayed choice" version of the double slit experiment, can you devise a way to send Information (in this case the winning lotto numbers) Into the past? I imagine that one could convert the winning numbers into binary, assigning a 1 for wave experiments, and 0...
  11. J

    B Double Slit detectors question

    My question about the double slit experiment is this: why is it that nobody suspects that the detectors used to detect particles as they pass through the slits in the double slit experiment aren't causing some interference with the experiment which makes it seem as though they are acting like...
  12. Bill_W

    B Quantum Physics -Double Slit Delayed Observation

    Thanks in advance to all who reply. Forgive me if this naive, I am not scientifically inclined, but I am VERY curious. After re-watching a documentary on quantum physics, I have a "thought experiment" that I would like feedback on. Maybe this experiment (or something like it) has already been...
  13. GiuseppeP

    I Double slit experiment: two persons are checking the experiment

    Hello, in the double slit experiment, what will be the result if two persons are checking the experiment using the same equipment to perform the experiment, but one person will take note from which slit is passing the electron while the other is not checking. Will they see the same thing...
  14. M

    How to find theta in a mutiple slit question

    Homework Statement A diffraction grating with 14100 lines per 2.54 cm (i.e., per in.) is used to view the visible spectrum from a Hydrogen gas excited by an electrical discharge. At what angle from the beam axis will the first order peak for the red photons with wavelength of 0.656 μm occur...
  15. M

    I How can you detect which path an electron will take in a double-slit experiment?

    Say, you're running an electron double-slit experiment, firing one electron at a time, only that half of the screen where you record the interference pattern is moved further away from the slits. How would that affect the interference pattern? Would the electrons still go in the same ratio 50/50...
  16. M

    Solving Double Slit Homework Qs: Phase Difference & Destructive Interference

    Homework Statement Two antennas located at points A and B are broadcasting radio waves of frequency 98.0 MHz, perfectly in phase with each other. The two antennas are separated by a distance d= 6.20 m. An observer, P, is located on the x axis, a distance x= 60.0 m from antenna A, so that APB...
  17. 6

    B Double Slit Simulator: Online Visualization & Path Variations

    Is there an online simulator which can be used to visualize the double slit interference? I know this can be done via equations, but as I am working with my kids on this, I prefer visual and want to add variations of different polarizers before each slit. If no simulator available, any...
  18. Titan97

    Uncertainty in single slit diffraction

    Homework Statement An electron is moving in a parallel beam along the x-direction with momentum, p=mv. It encounters a slit of width w. Assuming that the electron gets diffracted somewhere within the central maximum of small angular magnitude Δθ, estimate the uncertainty Δp in its momentum...
  19. C

    I Does the Double Slit Experiment Change When We Observe Particle Paths?

    I would like to show you my own opinion about DSE. I might be silly but I suspect data filtering issue. Let's suppose we have a detector DA for slit A, DB for slit B and a interference detector D0. If we consider the photon a wave pulse it means it will go either through a slit or through both...
  20. M

    B Regarding Young's two slit experiment

    regarding Young's two slit experiment 1. HOW can a light source is used to create a single photon that can be directed at 2 slits simultaneously ? I am confused as to how the light source can be aligned with both of the slits simultaneously. IF the light beam is wider than the distance...
  21. J

    A Can Protons Interact with Double Slit Construction?

    How are the double slits constructed? If you use electrons or photons then they should interact with that material or what?
  22. L

    Velocity of a Helium-atom in a double slit experiment

    Homework Statement Hi, I want to apologize for any grammar errors in advance since english is not my first language. But i hope it is good enough such that the question is clear: I want to calculate the velocity of a Helium-atom after it scattered on a double slit. The following information are...
  23. Cobalt101

    I Delayed choice two slit experiment - photon

    Is it possible that the reason the delayed choice two slit experiment outcomes occur is because for the photon, traveling at the speed of light, the past, present and future are all as one, and therefore it "knows" what is going to happen and therefore always "makes the right choice" at the...
  24. A

    I Double slit experiment question

    What is detected on the second screen if after a photon went through the slits but before it hits the second screen, the screen with slits is removed (or both slits are closed)?
  25. A

    A Is this experiment real (double slit)?

    I heard about the following experiment and I'd like to know if it really works this way: Double slit experiment with a detector that gathers information about which slit every particle goes through and stores it in an unobserved black box. The screen is an unobserved photo film that needs to be...
  26. ElMachoTaco

    I Question about double slit experiment results

    Is one particle detected on the detection screen for each particle shot in a double slit experiment? Or do some particles fail to be detected because they hit the barrier in between the two slits? In other words, is there an exact one to one correspondence of particles shot to particles...
  27. K

    Help explain the following formula? (Young's doubles slit)

    Hello, I'm currently writing a report on young's double slit experiment, and I've used the equation nλ/d = x/L and I was wondering if someone could explain the question? I know how it works, and how to solve for lambda, but could I have some more detail into why it works? For example, why can...
  28. D

    What Is the Diffraction Constant in This Double Slit Experiment?

    Homework Statement monochromatic light of 625 nm of wavelength falls normal to the optical bar. Total number of light lines that appear behind the bar is 11. What is the constant of the difraction bar? Homework Equations 3. The Attempt at a Solution [/B] I tried ##dsinx=ms## where ##s## is the...
  29. EmilyBergendahl

    Double Slit: Separation and Path Length

    Homework Statement A double slit apparatus is held 1.2 m from a screen. (a) When red light (λ = 600 nm) is sent through the double slit, the interference pattern on the screen shows a distance of 12.5 cm between the first and tenth dark fringes. What is the separation of the slits? (b) What...
  30. Liam C

    B How does the double slit experiment prove super position?

    I know this question has been asked before but I have only found threads for it at an undergraduate's level of understanding and I am just finishing ninth grade. How does the double slit experiment prove superposition? What led me to ask this question, was that, since when you close one slit the...
  31. L

    B Double Slit Experiment: Feynman's Lectures

    In the third book of Feymann's Lectures on Physics(section 1-8) he describes how "the Uncertainty Principle protects Quantum Mechanics." The experimental situation is a modified double slit experiment where the two slits are put on rollers in an attempt to detect which slit an electron passes...
  32. S

    Young's double slit experiment help

    1. The statement, all variables and given/known data Hi I'm doing this experiment where we need to find the wavelength of our laser light source. I am unsure what the variables IV and DV would be and the controlled variables? Also how will I make the graph? I'm in AS level so please don't make...
  33. I

    A Investigation of slit width influence on photoluminesce spec

    Hey there ! Does anybody have got any, any literature describing the effect of slit width and orientation of colloid Earth dopped nanocrystals (example NaGdF4 : Er, Y b) influence on PL Spectra? I will be very grateful for any book, article or your own helpful depiction ;)
  34. T

    What Is the Intensity in a Triple-Slit Experiment?

    Homework Statement A triple-slit experiment consists of three narrow slits, equally spaced by distance d and illuminated by light of wavelength λ. Each slit alone produces intensity I1 on the viewing screen at distance L. Consider a point on the distant viewing screen such that the path-length...
  35. JohnGaltis

    Young's Double Slit with 2 Wavelengths variant

    Homework Statement A point light source is used in a Double Slit experiment. The light source contains two wavelengths(500nm and 600nm). Separation of the two slits d=1mm. Two sets of interference fringes are formed on a screen. Find the angles θ where bright fringes are formed for both the...
  36. Negatratoron

    B What constitutes a measurement of which slit - double slit

    In the double slit experiment, when you measure which slit your photon passes through, it will land in the corresponding location on the photosensitive film at the end of the apparatus. If, however, you don't measure which slit it goes through, an interference pattern will appear on the film...
  37. W

    Single Slit Diffraction Intensity

    Homework Statement A narrow slit is illuminated by a collimated 633-nm laser beam as shown in the figure below. This produces a diffraction pattern on a screen, which is 6 m away from the slit as shown in the figure below. The distance between the centres of the first minima outside the central...
  38. D

    I Determination of electron energy in the 2 slit experiment

    If w3e fire electrons thru the 2 slit we get an interference pattern showing the wave nature of the electron. Now if we cover one of the slits and fire electrons we get a bar like pattern on the screen. If we cover one slit, fire electrons and use a detector we would also get a bar like...
  39. JohnGaltis

    Double Slit Question with Thin Lens concept

    Homework Statement Consider a double slit experiment with a light source of 540nm. Slit separation is 4mm. A thin glass plate is placed in front of one of the slit,, resulting in each bright fringe moving to the location of the adjacent bright fringe. Find the minimum thickness of the glass...
  40. F

    How is the amplitude of a wave related to the slit width?

    Homework Statement How is the amplitude of a wave affected if the slit separation remains same but slit width is 1.)Increased? 2.)Decreased? and why? Homework Equations Intensity is proportional to the square of amplitude The Attempt at a Solution I consider the amplitude as allowed...
  41. L

    Uncertainty -- particle through single slit

    Homework Statement Some particles pass through a single slit of width W = 0.17 mm. After the particles pass through the slit they spread out over a range of angles. The de Broglie wavelength of each particle is λ = 561 nm. Use the Heisenberg uncertainty principle to determine the minimum range...
  42. DavidReishi

    I Technical question about modern Double Slit w/ one photon

    My question is about the experiment in which detectors are used behind the slits to determine which slit the photon goes through. Specifically, it's about the detectors themselves. What I found is that these detectors are some kind of photoelectric detectors. My question is this. During the...
  43. C

    How Wide Is the Slit in a Diffraction Experiment with 450nm Light?

    Homework Statement When 450nm light falls on a slit, the central diffraction peak (central maxima) on a screen 2.0m away is 6cm wide. Calculate the slit width? wavelength= 450 x 10^9m L= 2m y= 0.06m w=? Homework Equations y/L = tantheta = sintheta sintheta = (m+1/2)lambda / w The Attempt at a...
  44. D

    I Laser diffraction through single slit

    Will a laser diffract through a single slit if the laser beam width is smaller than the slit? Such that the laser beam can pass though without touching the sides.
  45. vetgirl1990

    Finding the angle of phase difference - two slit model

    Homework Statement Light of a wavelength 548nm illuminates two slits separated by 0.25mm. At what angle would one find the phase difference between the waves from two slits to be 2 rads? Homework Equations σ / λ = ΔΦ / 2π σ: path difference λ: wavelength Δφ: phase difference The Attempt at a...
  46. E

    Young's Double Slit - Low intensity

    Homework Statement Having recently completed an experiment on Young's double slit experiment for both high and low intensity light; I am having trouble writing conclusions in the report. In one part of the experiment I know I was firing only one photon at a time down the tube, and I achieved an...
  47. T

    Questions of single slit diffraction

    Homework Statement I have a question on a practice midterm my professor sent out. I would ideally ask him, but I won't see him until itake my midterm. Instead I am attaching the question and solutions at attachments. THe question of interest is in the attachment "physics question" and the...
  48. D

    B How Does the Double Slit Experiment Show Both Particle and Wave Behaviors?

    From my shallow understanding, when we shoot a small amount of electrons through the slits while observing, the observation interfere with the electrons and the quantum system and thus collapse the wave function, making the electrons behave like a particle and form a 2-slit pattern on the...
  49. I

    How to calculate slit separation?

    Homework Statement Light of wavelength 680 nm falls on two slits and produces an interference pattern in which the fourth order fringe is 38 mm from the central fringe on a screen 2.0 m away. What is the separation of the two slits? Homework Equations d * sin(theta) = m * lambda The Attempt...
  50. C

    B Quantum Mechanics vs. Pilot-Wave thought experiment

    Hello. I want to share a thought experiment that could tell Quantum Mechanics apart from Pilot-Wave interpretation. It goes like this: Quantum Mechanics vs. Pilot-Wave: Quantum Mechanics: Waves collapse to particles. Waves disappear when particles are detected. Pilot-Wave: Waves are real but...
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