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. D

    Single Slit Diffraction and Interference Maxima

    In a single slit experiment if the condition of interference maxima be asinΘ=nλ where n=1,2,3,4... and the condition of diffraction minima is also the same Will it not cause any effect on the intensity of the interference maxima as both are at a same distance from the central maximum on the...
  2. A

    Single Slit and Diffraction Grating Formulas

    Hi everyone. I am having some difficulty understanding the formulas of single slit diffraction and diffraction gratings. This is partly because the formulas that I have been given in class do not reflect what I have found online entirely. As we know, the formula for single slit destructive...
  3. L

    B Does Human Observation Affect the Double Slit Experiment Results?

    Let's say we do a double slit experiment with the standard laser/two slit setup with a screen to view the pattern. 1. In the first run, we just turn on the laser and observe the screen with our unaided eyes. We see an interference pattern consistent with the wave-like nature of light, correct...
  4. M

    Central Maximum Shift Due to Glass Slit in Double Slit Experiment

    Homework Statement Light of wavelength 600 nm passes though two slits separated by 0.20 mm and is observed on a screen 1.5 m behind the slits. The location of the central maximum is marked on the screen and labeled y = 0. A very thin piece of glass is then placed in one slit. Because light...
  5. P

    Double slit interference: moving waves

    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...
  6. DaTario

    Fringes in a One Slit Experiment with a water tank

    Hello All, I would like to know why it´s so difficult to find information about the generation of fringes in a one slit interference experiment in a water tank. Best Regards, DaTario
  7. B

    B Poor man's double slit etc. setup

    Hi, what is the cheapest double slit experiment setup or others where quantum state like qubits are isolated and can be experimented upon? I saw the following in the net. It has a double slit inside the tube and the output is displayed on a monitor. I guess (not sure) it costs only $200. Has...
  8. R

    I Two slit experiment w baseballs

    Would it be theoretically possible to perform a two slit experiment with, say, baseballs? How would such an experiment need be set up?
  9. B

    I Concerning concioussnes and the double slit experiment.

    Hello there, I have a question about the double-slit experiment and conscioussnes. Excuse me if I don't formulate things right and might come over as a total fool for asking this (English is not my native language and i don't study physics). I just saw this video: <Moderator's note: link...
  10. I

    Limitations of Young's double slit experiment

    Homework Statement From a procedure standpoint, our experiment consisted of a laser pointer on a retort stand with a holder, shining through a piece of sheet with slit measurements (I believe it's acetate) and measuring the height of the maxima on a whiteboard. What could be improved with this...
  11. I

    B What are some limitations to Young's Double Slit Experiment?

    From a procedure standpoint, our experiment consisted of a laser pointer on a retort stand with a holder, shining through a piece of sheet with slit measurements (I believe it's acetate) and measuring the height of the maxima on a whiteboard. What could be improved with this experiment?
  12. I

    B Slit Distance - Young's Double Slit Experiment

    I understand Young's Double Slit Experiment, which basically consists of pointing a laser through two slits and seeing the maxima with different brightness, caused by constructive and destructive interference respectively. Through the experiment, I know that increasing the distance between the...
  13. R

    B Some very basic questions around the double slit experiment

    I have a few basic questions about the double slit experiment and was hoping someone might be able to answer them. 1) How far apart from each other would have I have to make the slits so effectively no detection took place? E.g. is there a limit to how far the wave function can spread and a...
  14. C

    B How Does Detector Placement Affect Ratios in the Double Slit Experiment?

    Here is a setup that only uses fixed detectors. Will the ratio between the number of detections at D0 and the sum of the numbers detected on D1 and D2 be close to 1? For this question instead of the coincidence counter, 3 simple counters are needed. Also the detectors D1 and D2 need some lenses...
  15. F

    B Is the Momentum Explanation in Marcella's Paper Consensus Among Physicists?

    How true is this? Do you believe that in the double slit experiment, what is subsequently measured at the detection screen is actually the particle’s momentum?? How does this differ to the normal double slit explanation of the particle being deflected left or right of the slit, etc...
  16. K

    Diffraction work differently on water waves vs light waves?

    When the water waves go through one wide slit (slit wider than wave length), there's no fringes, the water waves spread all over the sides, like in this pic: http://electron6.phys.utk.edu/light/images1-3/misc3b.jpg or in this pic...
  17. R

    B Can retrocausality explain the wave properties in the double slit experiment?

    Apologies if this is a ridiculous question (I have zero scientific education). I recently watch a video about retrocausality and thought that this may be an explanation for the wave properties of a single photon fired in the double slit experiment. My scientific ignorance will be on full show...
  18. D

    Single Slit Fraunhofer Diffraction

    Just to clarify, this isn't homework. I took an Optics course a few years ago, but in the time between then and now, I've lost all my notes. Suppose we have an infinitely tall slit of width a and a parallel screen a distance r_0 away. Let the x axis be parallel to the width of the slit, with...
  19. bknock

    Thin slits and accuracy of Kirchhoff's diffraction formula

    Imagine a single slit with plane light waves incident on it with a screen (ideally far enough from the slits to simplify the math). According to Kirchhoff's diffraction formula, when a very wide slit is doubled, average intensity (averaged over all diffraction angles) doubles, and so does E_peak...
  20. T

    B Exploring Entanglement in the Double Slit Experiment

    In the double slit experiment , if one place only one detector around one slit, while leaving the other slit unchecked, the interference pattern vanishes. Does this show entanglement?
  21. T

    B Double slit experiment question

    In the double slit experiment does the screen and the cardboard with the slits count as an observer since the electron interacted with them?
  22. H

    I One by one photon delay in double slit experiment

    In a 'one photon at a time' double slit experiment, does the interference pattern still emerges if the time delay between individual photon emissions is increased to minutes or even hours?
  23. Andy_K

    B Double Slit Experiment: Timing & Reflection Interference

    Dear All, I have a couple questions on the double slit experiment I hope you can help shed some light (or photons) on. =) Arrival Timing of Photons In a normal double-slit experiment like the above setup, do photons always arrive at the detector at a constant speed (basically, speed of light)...
  24. Andy_K

    B Double Slit Experiment: Detection around slit?

    Dear All, I have a question on the double slit experiment. From the references I've read so far, they are focusing on the results of the detector AFTER the 2 slits. Let's say when photons are fired, how many % actually pass through the slits and get detected at the end? Would some (and how...
  25. G

    Diffraction of Sound Waves Through Slit

    Hi there, I have a scenario in which different frequencies will be played behind a curtain with a 2m opening. I would like to calculate the angle of diffraction for different frequencies played by the piano. One equation that I came across through research is Fraunhofer's Single Slit equation...
  26. M

    A Double slit experiment wave interference?

    Hi, my answer is about the double slit experiment: the interference is observable with the water waves, them are particle in movment, but when we observe it with the electrons, what is the medium for those waves? Are the particles made of matter between the gun and the slits? Or is it something...
  27. S

    B Double slit experiment - doesn't measurement affect photons?

    All these videos and articles about the Double Slit Experiment say that if we "look" where the single photons go, they act like particles and if we don't "look" they act like waves, creating the interference pattern... BUT What does it mean to "look"? We're not using our eyes or any camera...
  28. John Morrell

    I Understanding Double Slit interference and Uncertainty

    I've recently been doing some learning about the double slit experiment and a bit about how, qualitatively, quantum electro dynamics works. Something that I wondered about for a long time was how momentum could be conserved in these systems when we assume that a particle could land in any number...
  29. terryds

    B Can Fringes Exist with Sine Value Greater Than 1 in Young's Double Slit Formula?

    In Young's double slit formula, the equation is d sin \theta = m \lambda Which means that sin \theta = m \lambda / d But, what if d < \lamda so the sine value becomes greater than 1? Will there be any interference?
  30. M

    What are the errors in Young's Double Slit experiment?

    Homework Statement I am having troubles trying to figure out systematic and random errors when conducting Young's double slit experiment. Homework Equations NA The Attempt at a Solution I have found one error which could be correct, it is the fact that the laser was not at right angles with...
  31. N

    Double slit experiment with a glass-covered slit of unknown n

    Homework Statement A double-slit experiment uses a helium-neon laser with a wavelength of 633 nm and a slit separation of 12mm. When a thin sheet of glass is placed in front of one of the slits, the interference pattern shifts by 5 fringes. When the experiment is repeated under water, the shift...
  32. L

    A 3rd method of finding wavelength in a double slit

    Homework Statement Upon using Thomas young’s double slit experiment to obtain measurements, the following data were obtain. Use these data to determine the wavelength of light being used to create the interference pattern. Do this in three different ways (6) • the angle to the eighth maximum...
  33. entropy1

    B Double slit probability question

    Consider the double slit experiment; if we position a detector at, say, the left slit, will a single particle, say, an electron, when fired at the slits, always be detected at the left slit, or will it be detected at the left slit 50% of the time? (so that it is 50% of the time at the right slit)
  34. H

    Single slit with minimum uncertainty

    Homework Statement A horizontal beam of laser light of wavelength 474 nm passes through a narrow slit that has width 5.80×10−2 mm . The intensity of the light is measured on a vertical screen that is 2.40 m from the slit. Use the result of part A to estimate the width of the central diffraction...
  35. O

    B Basic question about double slit interferance

    I am new here so I will start with a warming up question :) My question is very trivial here we go: In double slit experiment when shooting one photon at a time, we get interference pattern. Then when we put a sensor at one of the slits the interference pattern disappears because we now know...
  36. M

    I Double slit experiment in 3 dimensions?

    Has anyone performed the double slit experiment in three dimensions? By this I mean, having double slits and a detection screen on three sides? This would imply there are 6 slits and 3 detection screens. What would we observe? Would we see the electron exhibiting wave like behavior (ie...
  37. L

    A laser emitting light with a wavelength of 560 nm (Single slit).

    Homework Statement Homework EquationsThe Attempt at a Solution a) see attached. b)[/B] i) Decreasing the width of the slit will cause less interference fringes to be seen, increases the distance amongst fringes and the fringes become wider. ii) If the screen was moved further away, fewer...
  38. M

    B Double slit experiment wave collapse

    I would like to ask this question. In the double slit experiment on wave particle duality of photon, we know that the wave function collapses and the photon behave like a particle whenever we peek. Has anyone ever placed a second double slit behind the detector to see whether a particle regain...
  39. N

    Double Slit experiment separation

    Homework Statement A double-spit experiment is performed with light of wavelength 600 nm. A wide viewing screen is 2m behind the grating. What is the distance between the two m=2 bright fringes on the screen? The slit separation given is 0.1 mm. Homework Equations Given the wavelength and...
  40. hsdrop

    B Does Material Type Affect Double Slit Interference Patterns?

    Does it matter what the slits are made of? Do different kinds of matter make difference interference patterns on the wall? Also I know, part of that cause waves in the water is the surface tension. Does some kind of surface tension come into play with the double slit experiment waves of...
  41. Viopia

    B Double slit experiment -- consciousness and information

    I am not a physicist but I am interested in the double slit experiment and would like a definitive answer, from a physicist, to my question as follows:. If the which path is just detected by a detector, without it flashing and bleeping at the same time, and without the detections being recorded...
  42. S

    Double slit problem with glass block

    Homework Statement Light of wavelength 600 nm passes through two slits separated by 0.20 mm and is observed on a screen 1.0 m behind the slits. The location of the central maximum is marked on the screen and labeled y=0. (I only need help on the last 2 parts, but I will list all of them in...
  43. CricK0es

    What is the missing variable in the double slit interference pattern?

    Homework Statement Laser light of wavelength 517 nm illuminates two identical slits, producing an interference pattern on a screen 87.5 cm from the slits. The bright bands are 1.15 cm apart, and the third bright bands on either side of the central maximum are missing in the pattern. a.) Find...
  44. Arget

    What Happens to Double Slit Diffraction in a Ripple Tank?

    Consider diffraction in a ripple tank from two narrow slits. Answer true (T) or false (F) for each of the following statements. E.g., if the first statement is true and the rest false, enter TFFF. You have 6 tries. If the frequency of the wave source is halved, then the angle between the...
  45. Y

    I Double slit experiment questions

    I have a question on a particular version of the double slit experiment (I know there are many). I am not sure I understood it correctly, so I am going to explain it in a very basic manner and in my own words. You tell me if my explanation is correct or not, and then I have another question...
  46. phillovix

    B Double slit and randomly functioning measuring devices

    Hey there! This thread started off as a question regarding the impact of blindness on the wave function collapse, ended up thinking of an alteration to the double slit experiment that I think could yield some interesting results. So! Say the double slit experiment is run with measuring devices...
  47. learis

    B Trajectory of photon or electron in double slit

    Hello, first post. I recently became interested in quantum physics and its mysteries. To my understanding, In the double slit experiment, the photon or electron will scatter and behave like a wave when both slits are open and neither slit is measured. Over time their cumulative scattering mimics...
  48. wolram

    B Double slit experiment for layman

    In the literature we are told that the double slit experiment works but are given no description of the experiment apparatus How big are the slits, how far apart are they, or does it matter Would using 3 slits make a difference, would photon go through A and B, or through B and C, or all 3. When...
  49. A

    B When was the first double slit experiment done using a detector?

    When was it first experimentally seen that particle detectors can change the interference pattern effect expected in a double slit experiment? Is it still theoretical? What were some double slit experiments in the early era of quantum mechanics? How were they handled?
  50. pittsburghjoe

    I Criss-cross multiple double slit experiment paths?

    Has someone attempted to criss-cross multiple double slit experiment paths? The purpose would be to mix paths of observed and free particles. I want to know if clumps and fringes appear everywhere or we would get something new.
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