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. J

    Double, single slit, and diffraction

    Homework Statement Hi guys, I'm going through a rough time understanding double and single slit and diffraction. Here's the first problem: A) A single slit gives destructive interference when m*L=w*sin(theta). A double slit gives constructive interference when m*L=d*sin(theta). Explain...
  2. M

    Slit interference pattern depends or whether there is a clock in the room?

    Below is a question (paraphrased) which I addressed to two physics lecturers on the subject of slit diffraction. The problem I have is that answer I received from them sounds so ridiculous and impossible that I find it difficult to accept. I asked the question independently to both lecturers...
  3. M

    Single Slit Question: Linear Distance & Wavelength Calculation

    Homework Statement A single slit is illuminated with 660 nm and the resulting diffraction pattern is viewed on a screen 2.3 m away. a. If the linear distance between the 1st and 2nd dark fringes of the pattern is 12 cm. What is the width of the slit? Homework Equations W(X/L) =...
  4. E

    Single and double slit diffraction formulae

    Is the formula for single slit diffraction Dsin\theta = m\lambda identical to the double slit diffraction besides m being minima rather than maxima? More specifically will m + 1/2 tell me the angles between maxima?
  5. A

    Young's double slit experiment fringes

    I have some questions regarding Young's double slit experiment. 1.The first concerns the no. of possible fringes that will be formed. Sample question is as: Slit Separation = 1mm and wavelength of light is 5250 A. No. of illuminated fringes=? The basic problem is that I don't understand...
  6. G

    Why is it that diffraction is greatest when slit is close to size of wavelength?

    i think its to do with huygens sources?
  7. F

    Calculating Slit Width Using Microwave Wavelength

    Homework Statement Microwaves of wavelength 2.80 cm fall on a slit and the central maximum at a distance of 1.0 m from the slit is found to have a half-width (i. e. distance from middle of central maximum to first minimum) of 0.67 m. Find the width of the slit.
  8. fluidistic

    What Are the Key Distances in a Double Slit Experiment with 632.8 nm Light?

    Homework Statement A extent ray of light with wavelength \lambda _0=632.8 nm incide over a screen containing 2 horizontal parallel slits very thin and separated by a distance of 0.2 mm. We observe an interferance over a screen at 1.00 meter away from the screen containing the horizontal...
  9. C

    Interfering Photons: How Paul Dirac Explained the Double Slit Experiment

    If photon's cannot couple with other photons , then when we shoot photons through a double slit and we get an interference pattern , How are the photons interfering with the other photons , and if there is no such thing as half photon like the photon is either absorbed or it is not ...
  10. M

    Slit diffraction: time between emission and detection of photon

    For this question I am considering a slit diffraction experiment set up as follows: {Monochromatic source} ------> {Single slit} ------> {Diffraction grating with N slits} ------> {Screen with small movable detector} The monochromatic light source emits photons one at a time. The principal...
  11. D

    Quantum aspect of light waves with connection with Youngs Double Slit Experiment

    So let's say for example there is a slide with two slits on it infront of a screen. A beam of electrons is aimed at it. A) What would happen to the size of the fringes on the screen if I decreased the spacing between the slits B) What would happen to the fringes if I moved the screen...
  12. M

    Time period measured in double slit experiment

    In the standard double slit experiment, what time period is measured between the emission (t=0) and detection (t=T) of a single photon? I ask because clearly the photon does not take a single, well-defined path, as it would if it were a classical particle. Suppose that I set up an experiment...
  13. D

    Maximum Slit width diffraction minima

    Homework Statement What is the maximum slit width so that no visible light exhibits a diffraction minimum?(Visible light has wavelengths from 400 nm to 750 nm.) Homework Equations D*sin(theta)=m*lambda ; where D = slit width,theta in degrees, m =1,2,3,..., and lambda is wavelength...
  14. H

    Double slit diffraction maxima

    What effect does the distance between the two slits have on the intensity of the maxima?
  15. F

    'double slit experiment problem'

    Homework Statement q. when the width of both slits in double slit experiment is increased or decreased what happens to: 1. separation of fringes 2. brightness of light fringes 3. brightness of dark fringes and why? Homework Equations - The Attempt at a Solution couldnt...
  16. O

    Understanding Young's Double Slit Experiment: Why 4.5 Fringes Shift?

    I have a problem on Young's double slits which says that the central bright fringe shifts 4.5? fringes after a piece of plastic is placed in front one of the slits. My question is: Why is the central bright fringe shifted for 4.5 fringes? Shouldn't it be 0.5 fringe instead since maximum...
  17. B

    How Does a Thin Glass Plate Affect Young's Double Slit Experiment?

    Homework Statement The Young's double slit experiment is modified, as shown below, by placing a thin parallel glass plate of thickness d and refractive index n over one of the slits. Here a is the slit width in the x direction and b is the slit separation also in the x direction. The system...
  18. H

    Using young's double slit experiment

    can it be possible that using young's double slit experiment or by any metod on converging and magnifying the intensity of microwaves it can give same effect as LASER
  19. V

    Alternative Explanation for Double Slit Interference

    i think I have an alternative explanation to the double slit.We can assume that the slit surface is not completely smooth,thus a photon may enter these gaps thus allowing for interference in the case of single photon emitter
  20. H

    Single Slit (Fraunhoffer) Diffraction Question

    hey quick question about Fraunhoffer diffraction: RESTULT 1 for a rectanguar apperture, we have the following equation for irradiance I: I = I(0)(sin(B)/B)^2(sin(A)/A)^2 = I(0)[sinc(B)]^2[sinc(A)]^2 where, B = bu/2; A =...
  21. A

    Absorbing Material Over a Slit in Deriving Double Slit Fraunhofer Interfernce Pattern

    In class we have been deriving the Fraunhofer interference pattern for a double slit experiment. I now have a question of having to derive it if one of the slits is covered with an absorbing material. I have got the equation out but I am missing a constant K... Homework Statement We have two...
  22. M

    Measurement problem in double slit experiment

    In double slit experiment of electron, we see an interference pattern when we don’t know through which slit electron has passed and we don’t see an interference pattern when we know through which slit electron has passed. Now, to identify the slit through which electron has passed, we use...
  23. K

    Find wavelength in double slit experiment

    Homework Statement Two narrow slits are 0.4 mm apart. The dark fringe of order 5 is 1.2 degrees from the central bright fringe. What is the wavelength of the light in nm? Homework Equations dsin(theta) = (m +1/2)lambda where d = distance between silts m=order lambda = wavelength...
  24. B

    Two Slit Interference Question

    Hey guys, I am trying desperately to figure this problem out. I have not done a problem like this ever before, and it is on our homework in a regular high school physics class. The teachers did not even teach us, this is just my attempt from research and previous knowledge. Homework...
  25. P

    Double Slit Experiment Questions: Detectors

    Hi Everyone, I'm trying to fill in some gaps in my understanding of the double slit experiment. I think I'm most confused about the detectors. Before I start asking questions, I'd like to spell out what I think I understand with a summary: --- Summary of DSE --- Equipment 1. source...
  26. R

    Does different observer affect double slit particle experiment

    if the double slit particle experiment is observed by an animal and not by any human for eg. chimpanzee, through which slit the particle has passed would it collapse the wave function and form particle pattern. The particle are only observed by the chimapanzee, so it can know which slit the...
  27. R

    Most basic double slit experiment question

    Mechanically speaking, where is the photon emitter aimed when there are 2 slits? If the experimenter was using an accurate emitter, wouldn't he/she expect the photons to hit only where it was aimed, e.g. either one slit or neither slit? Is it that the emitter oscillates, so it can aim at each of...
  28. R

    Double slit electron experiment inquiry

    I have been trying to understand the result of the double slit electron experiment I’m still not clear abt the result of the experiment. I have seen the Dr. Quantumm - double slit experiment video(). Its very simple explained. it says when an measuring device is placed to look through...
  29. S

    Young's Slit Interference (Double Slit)

    Find the slit separation of a double slit arrangement that will produce interference fringes 11.5 mrad apart on a distant screen with light of wavelength 471.0 nm. tan(theta) = y/D asin(theta) = p * wavelength I know that I'm trying to solve for a, and that asin(theta) = 11.5, but I feel like...
  30. K

    Double slit experiment, observer effect

    It was a good while ago since I heard about this particular experiment, but I remember vaguely reading about how in one instance they recorded the observations, but then deleted the data before anyone could look at it, and in that instance the wave was still produced. Thus showing that it really...
  31. K

    Can we do double slit experiment using quasiparticles?

    Can we do double slit experiment using ,let's say phonons.
  32. T

    Huygens' Principle: Exploring a Single Slit Experiment

    Hello , as per diagram (attached) regarding Huygens slit experiment / diagram When the wave enters the slit - why does it form a number of point sources ? There are 6 as per the diagram, Are these the horizontal wavelengths of the electromagnetic waves ? Thanks, much appreciated
  33. X

    Width of the first dark fringe (2 slit interference)

    Homework Statement In a double-slit experiment, the two narrow slits are spaced 0.20 mm apart. A viewing screen is put 1.2 m behind the slits. A parallel light ray is shining on the slits. (a) If the wavelength of the incoming light ray is 633 nm. What is the width of the central bright...
  34. A

    Why Don't Photons Get Absorbed in Double Slit Experiments?

    hi maybe I'm asking a stupid question, I'm a layman, and i didn't succeed to google out the answer. while performing single photon double slit experiment, why the photons don't just get absorbed in the separation between the slits, like they do in the screen behind. and consequently...
  35. K

    Rotating single slit and 2 single slits merging

    a link to my youtube page of a rotating single slit and 2 single slit's merging,comments welcome on what you think it shows,or don't show
  36. M

    Double Slit Question: Find Angular Separation for m=2, 412 nm, 349 l/mm

    Homework Statement A grating with 349 lines/mm is illuminated with light of wavelength 412 nm What is the angular separation between the two lines formed in order m=2? Homework Equations \vartheta = m\lambda/d The Attempt at a Solution I did not know how to use this equation...
  37. P

    How do I generate a diffraction pattern using FFT from a single slit?

    Hi, I am a bit confused regarding using FFT to calculate the 1D single slit diffraction pattern.. Let's take the simple setup shown here: http://electron9.phys.utk.edu/optics421/modules/m6/images/sslit.gif" If I wanted to do a quick calculation using Matlab, I would create a 1xN matrix...
  38. S

    Hypothesizing on photon mode of travel in double slit or similar experimental setups

    Delayed choice in half silvered mirror or double slit For now, I am focussing only on the half silvered mirror: there are two paths/arms that are created. My question is: 1. If a detector/obstruction is placed on either of the two paths after the photon has passed but before its hit...
  39. S

    Young's Double Slit Experiment w/ White Light & Water

    Homework Statement 1. What will happen if we use white light as the source of young's double slit experiment? 2. If the experiment is done in water, what will the effect to the yn? yn is the distance of nth fringe from center fringe. Homework Equations d sin θ = nλ d y/D = nλ The...
  40. C

    Diffraction from a single slit.

    Homework Statement You need to use your cell phone which broadcasts an 830 MHz signal but you're in an alley between two massive radio wave absorbing building that have only a 15m space between them. What is the angular width in degrees of the electromagnetic wave after it emerges from between...
  41. K

    Young's double slit experiment (shallow slit and deep slit)

    i have posted a video on youtube,where i did the double slit experiment,firstly with a shallow slit,then with a slit approx 35 times thicker,then did the experiment without lens on laser,i would like to have a chat about what it all shows,and what it says to you (any one)
  42. LarryS

    Double Slit Experiment and Measurements

    When a photon encounters a beam splitter, say a half-silvered mirror, there is a 50-50 chance it will be reflected or passed (tunneling). Does being reflected/passed constitute a QM "measurement"? Thanks in advance.
  43. E

    Why can't I see the interference pattern in the double slit experiment?

    I'm reading the double slit experiment (Cohen-Tannoudji chapter 1 - complement D) and it is said: "We are going to consider Young's double slit experiment again to demonstrate how complementary and uncertainty relations are intimately related. Assume that the plate P, in which the slits are...
  44. M

    Is Wave-Particle Duality Really Real? An Analysis of the Double Slit Experiment

    Hi all, I'm not trained in physics beyond high school but have a healthy interest and understand a little quantum physics and special (still grappling with general!) relativity. Here's a quick question on a pop.science book I'm reading at the moment. The book is by Marcus Chown, it's called...
  45. F

    How Many Bright Fringes in Central Diffraction Maximum?

    Homework Statement A parallel beam of mono-chromatic light (500nm) is incident on 2 long narrow slits: slit width is 0.1mm and the distance between slit centres is 0.3mm. a) How many bright fringes cover the central diffraction maximum? Homework Equations Condition for constructive...
  46. P

    Does Distance Affect the Double-Slit Experiment?

    Does the distance from the photon/electron gun to the slit matter at all? Or even the distance from the slit to the photographic plate?
  47. K

    Interference fringes in Young's Double Slit Experiment

    Homework Statement Light of two wavelenghts L1 and L2 (L1,L2 = lambda)creates interference fringes in the Young's double slit experiment. To calculate the least distance from the central maximum where the bright fringes for both L1 and L2 coincide. Given: the distance 'd' between the two...
  48. M

    Find Single slit diffraction width

    Ive been marked wrong but not sure why: The distance between the first and fifth minima of a single-slit diffraction pattern is 0.400 mm with the screen 41.0 cm away from the slit, when light of wavelength 570 nm is used. Find the slit width. y=m(theata)D/a m-order = 5 D-distance...
  49. S

    Doube slit electron with single slit photon emitter and detector

    Basically I am wondering if the act of detecting the path which the electron didn't go affects the interference pattern. But I'll be more specific. So we have the double slit experiment with electrons, they have a 50/50 chance of going through each slit, and if we have this setup we will...
  50. N

    I now know what slit the photon came out of

    Correct me if I'm wrong, but isn't it a fact of quantum life that it's not possible to obtain a diffraction pattern from the double-slit, while at the same time knowing what photon emerged from what slit? And if I am not wrong, wouldn't it be a simple matter to conduct such an experiment based...
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