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. S

    Double Slit Experiment: Exploring Quantum Mechanics

    I think I am on the right track in understanding QM because I am very confused :smile: Few questions: 1. Let's say electrons are emitted from the electron gun towards a slit. Do the electrons display the wave property even before passing through the slit right after leaving the electron gun or...
  2. M

    How Is Wavelength Calculated in Single Slit Diffraction?

    Homework Statement What is the wavelength of the light whose first diffraction max (not counting the central max) falls at 15°,thus coinciding with the first min for red light?Width of slit=2510 nm." It is an example problem from Halliday Resnik Krane..In which the they use the principle...
  3. C

    Double slit experiment: effect of changing wavelength

    Homework Statement The question is regarding Young's double slit experiment. "Describe the effect, if any, on the separation and on the maximum brightness of the fringes when the following changes are made. ... ... 2) The wavelength λ is increased to 1.5λ, keeping a and D constant...
  4. T

    Difference between double slit diffraction and interference?

    Can somebody explain to me what is the difference between double slit diffraction and double slit interference?, to me they are the same thing but my teacher says they have two different meanings, thanks.
  5. E

    Two-Slit Experiment: Photon Energy Shift from Gravity

    If we perform the two slit experiment vertically - so the slots are above one another - we should observe a small amount of red / blue shift in the energy of the photons when they hit the screen (due to gravity). The path length from each slit is not symetric so the arriving photons energy would...
  6. S

    Double Slit Experiment: Wave-Particle Duality

    Here is a noobie thought. We all know the double slit experiment (say for electrons) and the explanation that electrons behave like both wave and a particle. So they pass through both the slits forming the interference pattern. But I think a quanta (electron in this case) behaves like a...
  7. E

    Double slit - why do we get an interference pattern?

    In a standard 2 slit experiment setup when the interference pattern is visible - if the screen is moved forward the pattern must 'move' across the screen as the alignment of wave peaks and troughs change. I.e if we start with an intense band at the centre then move the screen forward half the...
  8. T

    Double slit: Human vs Machine Observer

    Would someone help me to understand what would happen in this situation. w→ x→ (y)→ z Photon emitter is at point w emitting photons one at a time. Double slit is at point x. Screen is at point z. There is a detector at point y (after photon has already passed through slits) which is capable...
  9. M

    Double slit experiment on a moving train

    So I asked this question in another thread but thought the question was probably best asked here in this forum to at least understand part of the experiment. My idea follows the traditional train and platform analogy that is used in many thought experiments to explain the issue of simultaneity...
  10. M

    Quantum uncertainty after passing through a slit

    Homework Statement A given particle is confined to a certain potential. At a given instant that potential is turned off and the particle is accelerated by gravity. In the initial instant t = 0, when the potential is turned off, it has an initial speed of vz = 1 m/s. In the instant t = 0...
  11. M

    Question about the double slit experiment

    So I'm curious. When in one instance where light behaves as a wave and you get an interference pattern, and in another instance where light behaves as a particle and you don't, does the intensity of the inner most bands of light change at all? When we place a detector beside one of the slits and...
  12. R

    Double slit experiment intensity distribution

    Homework Statement I need to derive the intensity distribution of the double slit experiment. Intensity as a function of the slit separation d, the distance to the screen L and the wavelength \lambda. L>>d Homework Equations The Attempt at a Solution Ok this is ridiculous but...
  13. S

    What happens to the freq of a photon after encountering double slit?

    1. (How) Is the frequency of a photon effected after encountering a double-slit or a half silvered mirror (say in a Mach-zehnder)? 2. Are particles such as photon, electron, assumed to be entangled, at all points in time-space, with something or the other?
  14. S

    How does the double slit experiment prove many worlds?

    Hi, I`ve been reading and watching videos about the double slit experiement, and when scientist fire one electron at a time through the double slits, and the do not interfere, how does that prove that there are more dimensions and that sub atomic particles are in a superstate. How does that...
  15. resurgance2001

    Young's double slit gone wrong

    Hi Everyone I was trying to do a young's double slit experiment with green laser. The gap between the slits was d = 0.001m The distance to the screen was D =1.2m We counted from the center 10 bright fringes m = 10 The distance of the from the center bright fringe was y = 0.067...
  16. L

    Another double slit question - noob

    another double slit question - noob :( Hi guys, I never officially studied physics so my knowledge on the topic is limited. My understanding of quantum physics in relation to the double slit experiment is the following: When you only observe the end result of light, it appears as if it...
  17. 5

    What Wavelengths of Light are Used in Young's Double Slit Experiment?

    Homework Statement using the formula Δy = λL/ d calculate the fringe separation (d) for the red and blue light used in the experiment Homework Equations as above The Attempt at a Solution So I rearranged the equation to read d = λL / Δy and I'm fine with the math, but I...
  18. R

    Young's Double Slit Experiment - Good Set Up?

    Hello, I'm trying to set up an experiment to measure the distance between tracks in a CD, using only 3 items. I can only use a cardboard box, a ruler, and a laser pointer, and I will be using a double slit. So I'm thinking I will cut two slits in the carboard box, place it in front of the...
  19. A

    Double slit experiment with multiple sources of particles

    Im somewhat new to modern physics, had one introductory class in my university and because it fascinated me so much, I've watched all the leonard susskind lectures on quantum mechanics, entanglement, and particle physics on youtube on the Stanford channel. Today I noticed something strange...
  20. Z

    Conservation of momentum of single photon passing a slit

    When a single plane-wave photon/electron passes a slit/orifice, its direction of travel becomes random. Although there is the well-known Uncertainty Principle, it is not a replacement of the law of conservation of momentum for the phonon/electron before and after passing the slit. Question...
  21. A

    Young’s double slit experiment

    Homework Statement In a version of Young’s double slit experiment, the slits are separated by a distance of 1.0 mm. The light from the slits is observed on a screen that is 12 m from the slits. If the wavelength of the light is 550 nm, what is the linear distance on the screen between the...
  22. L

    Neutron Beam Width after localization via a slit in a sheet (QM)

    Homework Statement A parallel beam of neutrons with speed 200m/s is incident on an absorbing sheet with a slit of width 0.01mm. Calculate the width of the beam 10m behind the slit. Hint The slit localizes the neutrons transversely (y) to their propagation direction x. The resulting ΔPy gives...
  23. C

    I don't see what's weird about the double slit experiment

    I've been reading & watching videos about the double slit experiment, and I'm failing to see what's so interesting & strange about it (I hope someone can enlighten me on what I'm missing). The weirdness is NOT the fact that observing an electron changes it's behaviour (right?) At first I...
  24. E

    The Double Slit Experiment & its Connection to Pseudoscience

    The Double Slit Experiment & its Connection to "Pseudoscience" Introduction Hello everyone :), thank you for taking the time to view this as I have ALOT of questions regarding The Double Slit experiment and its connection to "The Law of Attraction" (LOA) or what many call pseudoscience. I...
  25. R

    The meaning of double slit experiment

    The meaning of double slit experiment... As i understand the outcome of the double slit experiment is firstly the Photons of light that were fired have no true location and seem to jump about and interact with themselfs. So my question to that is, have they tried anything bigger than a Photon...
  26. PsychonautQQ

    Double slit interference missing maximum problem

    Double slit interference "missing" maximum problem Homework Statement In the double slit interference experiment, d is the distance between the center of the slits and w is the width of each slit. For incident plane waves, an interference maximum is "missing" when what relationship between d...
  27. S

    Double slit superposition vs Entanglement superposition

    Superposition caused by - Double slit, Mach-Zehnder Quantum superimposed paths/waves interfere ...for example the double slit experiment (single particle interference) Quantum superimposed paths are effected by obstacles such as opaque, half silvered mirrors, refractive index transparent...
  28. P

    Can the Two Slit Experiment Be Conducted Without Observer Influence?

    Hi all! I heard about that the experiment had been iplemented so the observation don't effect the experiment. Because some scientists thought that the observation has an effect on the experiment and that's why the interference pattern doesn't appear at that time. My question is, how they do...
  29. Q

    Single slit width change, how would fringes differ?

    just to be clear, this is single slit diffraction of light if the slit width is made narrower, this would lead to more diffraction, so the fringe width would be wider, yeah? but I'm a bit confused, because is this basically the same as saying the fringe separation would be wider?
  30. S

    The cause of particle going through one slit of the other

    In the double slit experiment wavicles go through one slit of the other in roughly a 50/50 ratio. How does this not violate conservation of momentum? They would need momentum to push them to the right or the left.
  31. G

    Multiple Slit Interference and Driffraction Grating

    Homework Statement A five-slit system with 8.4*10-6 slit spacing is illuminated with 610*10-9 light. Find the angular position of the first two maxima, and the 3rd and 6th minima. Homework Equations For Maxima: d*sin(θ) = m*λ θ = sin-1((m*λ)/d) For Minima: d*sin(θ) = (m/N)λ θ =...
  32. B

    A modified double slit screen scenario- what would happen?

    This scenario is identical to the classic double slit screen experiment except that the photon is at extremely high energy. The energy is so high that the photon's momentum maybe registered by a mechanical measuring device(i.e spring or accelerometer attached to a receiver). At the moment of...
  33. T

    Diffraction Problem, Calculate Slit Width

    Homework Statement Light of wavelength 680nm falls onto a single slit. The diffraction pattern is observed on a screen 50cm away. If the distance between the first and the third minima is 3mm, calculate the slit width? Homework Equations sin thetha = m*lambda/a y = m*lambda*R/a...
  34. D

    Question regarding a double slit experiment

    Homework Statement The question is as follows, I'm truly stuck where to start here, any help would be much appreciated: A transparent paper of refractive index 1.45 and thickness 0.02mm is pasted on one of the slits of a double slit experiment. Monochromatic light of wavelength 620nm is...
  35. U

    Can Air Affect a Double Slit Experiment?

    Homework Statement Homework Equations The Attempt at a Solution As air is gradually removed from one box, the fringe pattern shifts towards that box. Hence total number of maximas that pass through the central is calculated. However, according to...
  36. H

    Gravity and the double slit experiment

    How would the double slit experiment work if we were to use gravity as a detector? That is, a very localized but massive gravitational field near one of the slits. Since we are not observing when an electron passes through the slit, the interference pattern should remain. But on the...
  37. V

    Young's Two Slit Experiment Question

    Question: I'm sure this is a stupid question, but it has been bothering me lately so I'll ask it anyhow. In Young's Two Slit experiment the conditions for max and min are dsin\theta=m\lambda (max) dsin\theta=(m+\frac{1}{2})\lambda (min) where m is an integer and d is the separation of the...
  38. C

    Single Slit Diffraction question

    Homework Statement I'm having difficulty understanding why this equation makes sense for the following m values. Homework Equations The following is stated in my textbook. For dark fringes, sinθ = (mλ)/a where λ is the wavelength of light in nanometers and a is the width of the single...
  39. C

    [Double slit experiment] if we look back at slit, what we'll see?

    from picture, If we put camera directly at screen and look back at slit. move camera around fringe A, B, C ... what we going to see? in bright fringe A, we should see light source through one of two slit, when in dark fringe, we should shadow between slit, and when in bright fringe B...
  40. T

    Photons Moving Through a Single Slit (Uncertainty)

    Homework Statement The diagram is attached. Photons are being beamed with momentum \rho_{0} and mass m at a slit of width A Estimate the uncertainty \Delta p_{y} emerging from A Sketch spot size at B as a function of slit width using the uncertainty principle Determine minimum spot size...
  41. H

    Double Slit & Compton: Understanding the Connection

    hello everyone today I am curious about " is there relation between double slit and compton??" my friend said there has relation between them but i cannot understand please help me
  42. U

    Width of single slit diffraction

    Homework Statement Homework Equations The Attempt at a Solution Part(a) Diffraction is the bending of light about an aperture. To be able to resolve two distinct images, the minimum angle must satisfy the rayleigh criterion. Any angle smaller will hence affect the quality of...
  43. C

    A question about the double slit experiment

    Is there any evidence that when the electrons pass through the single slit as a wave rather than a particle? Just curious because a single wave should provide the same Pattern as a particle.
  44. K

    Double slit experiment with electrons

    I often read that electrons that pass through two small openings in a wall will land on a back screen and make a pattern as if the electron were a wave. But if we look at the electrons the distribution on the screen is as if the electrons are particles. What does it mean to "look at the...
  45. H

    Double slit interference experiment

    If separate baffle around two different substances，What impact on the interference fringes？
  46. S

    QM operator and double slit experiment doubt basics

    well i am a starter in QM, i have 2 big doubts ! let me first tell what i understood , there is phsi which defines a state of a system, phsi times x is a position operator and phsi 's derivative of x multiplied by i h is its momentum operator ... well then i operator these in phsi and what do...
  47. G

    Double slit questions from an observation perspective

    Some questions have been haunting me about this experiment for some time. I'm mainly interested in what we observe from the perspective of the projection screen. First let's imagine that there is only one slit, and we are observing from the projection screen looking back at the slit with the...
  48. M

    Double slit experiment problem help

    Homework Statement Two narrow slits are .6 mm apart. The dark fringe of order 1 is 1.7 degrees from the central bright fringe. What is the wavelength of the light? Homework Equations D sinθ = (m + 1/2)λ --> chosen because it was destructive m= order d= distance between slit The Attempt at...
  49. O

    What will happen for single slit diffraction if?

    If the width of the single slit is much smaller than the wavelength of a monochromatic light, until there is only one point on the wavefront can pass through it? Thank you
  50. S

    Young's double slit and coherent light

    Hello all, I was looking through my textbook on the double slit and it talks about constructive interference occurring at path differences of m \lambda and destructive interference occurring at path differences of (m + 1/2) \lambda where m is an integer. This is obvious if the waves leave the 2...
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