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. T

    Double Slit Experiment: Accounting for Other Particle Interactions

    So, after reading a few different explanations of the double slit experiment, there is one aspect I am confused about. The set up is that you shoot out electrons/photons/whatever at a wall with two small slits. The particles pass through one slit, the other, or both if you're not looking...
  2. W

    Double Slit Problem: Laser Wavelength & Intensity

    Two lasers are shining on a double slit, with slit separation . Laser 1 has a wavelength of , whereas laser 2 has a wavelength of . The lasers produce separate interference patterns on a screen a distance 5.80 away from the slits. Part A Which laser has its first maximum closer to the...
  3. B

    Maximizing Single Slit Diffraction: Solving for the Largest Width Without Minima

    Homework Statement Light from a helium neon laser with wavelength 633nm is incident on a single slit. What is the largest slit width for which there are no minima in the diffraction pattern? Homework Equations The Attempt at a Solution For single slit diffraction...
  4. B

    Two Slit Experiment-What am I doing wrong?

    Homework Statement A two slit experiment uses a laser with a wavelength of 633 nm. A very thin piece of glass with an index of refraction of 1.50 is placed over one of the slits. Afterward, the central point on the screen is occupied by what had been the m=10 dark fringe. What is the...
  5. Loren Booda

    Is interference always present in a single slit setup?

    Do the walls of a single slit alone cause interference? In general terms, do all illuminated finite apparatus (e. g., a small sphere) include interference?
  6. S

    Questions on Feynman's view on Double slit experiment

    hi, I'm new to this forum and mainly because i have some questions regarding a book i am reading. Brian Greene's The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest for the Ultimate Theory mainly he explains the view that Feynman have on the double slit experiment as...
  7. I

    Single photon and the double slit

    If you send a photon towards some wall it will bounce back (or in some cases be absorbed), why don't the photons bounce back if you shoot photons at the middle of the double slit experiment? Do the photons have to be released at "random", and not in the middle? How's the experiment performed...
  8. N

    Deriving the formula for double slit diffraction as in Young from Fraunhofer

    Homework Statement I apologize for the blurriness in my title, I couldn't find anything better to fit within the length limit. The problem I'm stuck with, paraphrased, is to derive the formula for the diffraction pattern of a double slit, as found in the Young experiment, from the Fraunhofer...
  9. Hydr0matic

    Double slit experiment - QM or wave?

    I propose a setup to distinguish between the quantum interpretation and the wave interpretation of the double slit experiment. Briefly, they are: Quantum The photon gun fires a photon that travels through either slit A or slit B, then hits a detector cell registering a spot in the...
  10. H

    How to Calculate Angle in Double Slit Interference with Given Variables?

    Homework Statement We have the wavelength of 550nm and the distance (d) of 0.120mm. I need to calculate the the angle q. The diffirent parts of this questions corresponds to the diffirent order of n. a) Being n=1 b) n=5 c) n=10 Given variables; Wavelength = 550nm = 550*10^-9m d=0.120mm...
  11. S

    Watching young's double slit experiment in moving frame

    Suppose an observer is moving at some constant velocity(<< c) and observing the young's double slit experiment. What changes will it observe compared to an observer at rest? This is what i could make out : 1) The wavelength of incoming light will change (doppler effect) 2) By the intuition...
  12. J

    Double slit experiment -WHAt is it it showing or proving

    Double slit experiment --WHAt is it it showing or proving Im just not getting the general concept of what this experiment proves. Please explain in very simple language --thanks!
  13. thenewmans

    My First Double Slit Experiment

    Excuse me for patting myself on the back here but I just did my first successful double slit experiment. And it was easy! I poked 2 small holes in aluminum foil just as close as I could and shined my kid’s cheap red laser through them and Viola! I thought I needed razors and prisms and 2 lasers...
  14. K

    Exploring the Double Slit Experiment - Kev's Amazement

    Hi guys, I am new to this site and would like to say a little about the double slit experiment. I find the fact that the electrons or photons choose both paths unless being watched absolutely amazing. But what I find even more amazing to me is this: The electrons, when fired at the screen one...
  15. T

    Find Number of First Missing Maximum in Double Slit Diffraction Pattern

    Homework Statement A double slit is composed of two single slits. Each slit has a width of w = 0.01 mm and they are spaced s = 0.04 mm apart. Because the double slit is actually two single slits, the single slit diffraction pattern is superimposed over the double slit pattern and so some...
  16. C

    How Does Changing Slit Separation Affect Wavelength in a Two-Slit Experiment?

    Homework Statement An optical two-slit experiment is setup with its slits separated by 40 X 10-3 cm and produces a second order maximum at an angle of 0.09 degrees. What would the wavelength of the light need to be if we kept the position of the second order maximum the same, but increased the...
  17. N

    Double slit experiment - quick question

    Has anyone heard of anyone trying to conduct the double slit experiment with a barrier between the two slits that goes all the way or near the detector? If it could be done maybe it would be interesting to see the result. It may answer the question if the photon (or electron) is interferring...
  18. M

    Youngs double slit related problems

    Gday, I am having some trouble with these questions becuase i was away for the two weeks when we did them any help or explanation would be greatly appreciated. 1) A transmitter drivest wo radio antenna A and B placed 2\lambda appart. Each atenna emit radio waves, in phase, uniformly in all...
  19. Z

    Feynman's perspective on the double slit

    I am reading The Elegant Universe by Brian Greene. It is really wonderful, however, I am confused by a section about Feynman's view on the double slit expiriment. Greene writes: "Feynman proclaimed that each electron that makes it through to the phosphorescent screen actually goes through...
  20. A

    DOUBLE slit interference experiment

    the double slit interference experiment is set up and the fringes are displayed on screen. Then the whole apparatus is immersed in the nearest swimming pool. How does the fringe pattern change?? Which website I can get information?? Thanks.
  21. F

    How Does a Double Slit Create Coherent Light from an Incoherent Source?

    Young's double slit experiment produces regular intervals of bright fringes and dark fringes. The bright fringes happen when the 2 sources of wave are in phase and superimpose while the dark fringes are produced when the 2 waves are in antiphase and vectorially cancel each other out. However...
  22. R

    Observation and the Double Slit Expt

    So I'm embarking through Brian Greene's magnificent book The Fabric of The Cosmos and in the quantum section he goes through the whole idea about how observation of a particle leads to collapse of the wavefunction into a definite location. He also uses the double slit experiment for photons and...
  23. Z

    A Single and A Double Slit Question

    Two questions (I've got my AP Physics exam tmr :S) 1. What is the angular width of the the central maximum produced by a single slit of width 0.0011 cm if illuminated by blue light of a wavelength of 470 nm. So I used Sin () = (m+0.5) lamda/w 2. What is the max. number of bright spots...
  24. M

    Consciousness of Double Slit Observer

    Have any experiments been conducted that explore the state of consciousness of the observer in the double slit experiment? My understanding of the double slit experiment is this. Shoot one photon at a time through a slit and you get a line of light (particle model). Shoot single photons...
  25. B

    Electron two slit experiment with gradual collapse ?

    electron two slit experiment with gradual "collapse"? Just read about the two slit experiment with electrons where you try to find out through which slit the electron went by "shining a light on it" (Feynman lectures on physics I-37-7). I try to summarize the statement and then have a question...
  26. T

    What is the Angular Width of the First Bright Fringe?

    Homework Statement A double-slit with a separation of 2.1 μm is used with white light. Find the angular width of the first bright fringe between the violet (lviolet = 400 nm) and red (lred = 750 nm) end of the spectrum. (Assume two significant digits.) Homework Equations What exactly...
  27. G

    Single slit diffraction / wave propagation

    I have a couple of questions about single slit diffraction. It's not a homework exercise - just a conceptual problem. Here it is (with some introductory comments)... I understand that the diffraction pattern from a single slit is the modulus squared of the Fourier transform of the aperture...
  28. G

    Double slit electron experiment

    It seems physicists have come to the conclusion that a single electron travels through both slits at the same time, otherwise there wouldn't be an interference pattern when only one electron is being sent through the apparatus. Apparently this experiment has been done in real life. You can't...
  29. M

    Young's double slit experiment edges problem

    1. The photograph shows the interference pattern produced when monochromatic light falls on a pair of slits. I cannot post links yet but the photo is of a typical fringe pattern produced by coherent light waves from a double slit. Mark with an X on the photograph the fringe or fringes...
  30. F

    Wave-particle duality/double slit experiment

    Is it true that particles behave like waves when there is no observer but behave like particles when there is an observer? If so, how does the observer impact the behavior of the particles? Do electromagnetic waves play a role? Any insight would be appreciated.
  31. A

    Conducting the Double Slit Experiment

    hey everybody, I am doing a physics project on the double slit experiment. (I know all the physics and math behind it so don't get into that stuff :P) I was just wondering if people had any suggestions on how to conduct the experiment, I was thinking of cutting two extremely small (knife blade)...
  32. K

    How Does Covering One Slit Affect the Double Slit Experiment's Fringe Intensity?

    1. In a typical set up of Young's Double Slit experiment, if the widths of the slits are assumed to be infinitely small and 'y' is the distance from the central maxima on the screen, sketch a clearly labelled graph to show the variation of the intensity of the fringe pattern with 'y'. The...
  33. S

    Double slit experiment / Quantum interferometer

    Hi I would really appreciate if someone could answer what maybe a really simple question. I'm no physics expert but I do read a lot and I have a keen interest. My question is related to light interference and the double slit experiment. I know that by observing which slit a photon of...
  34. N

    Understanding Double Slit Interference in Electron Diffraction

    This might sound very basic but... when the electron passes through the two slits and we see the 'pretty' interference pattern on the opposite side what causes the dark fringes to be seen, how does an electron, after acting as a wave and then as an electron when it is recieved, interfere with...
  35. T

    Young's double slit experiment (prob density)

    Homework Statement http://img141.imageshack.us/img141/1395/40941671kx8.jpg http://img141.imageshack.us/img141/982/82443157pt9.jpg Homework Equations http://img85.imageshack.us/img85/4523/60192566ie7.jpg The Attempt at a Solution I'm not sure where to start with this one. I've...
  36. B

    How Do You Calculate the Width of a Slit in a Diffraction Experiment?

    Width of Slit...HeLP on setup Please! Homework Statement A helium-neon laser (λ=590 nm) illuminates a single slit and is observed on a screen 1.7 m behind the slit. The distance between the first and second minima in the diffraction pattern is 6.78 mm. What is the width (in mm) of the slit...
  37. X

    Solve Slit Grating Problem: Compute Wavelength of Light

    1. With light from a gaseous discharge tube incident normally on a grating with slit separation 2.23 μm, sharp maxima for a certain wavelength of light are produced at angles θ = -17.1° and +17.1°. Compute the wavelength of the light in nanometers. 2. I thought this would work...
  38. S

    What Is the Optimal Slit Width for a Visible Light Spectrometer?

    Homework Statement A visible light spectrometer has a grating of width D=10cm and a collimating lens of focal length L=1m. Show that the optimal width for the input slit is such that it will produce a diffraction pattern of width D. Homework Equations The diffraction pattern of a single...
  39. S

    What Variations Can Be Applied to the Double Slit Experiment?

    Hi. I'm preparing a research proposal for class and I've finally decided to do variations on the double slit experiment. What I'm looking at doing is performing the basic experiment using a red laser, just so I can make sure I have a good understanding of how to do it. Then I think I will test...
  40. R

    Double Slit Experiment With White Light

    Hi, I have a physics assignment which is asking me what the fringe pattern would look like if white light was passed through a double slit. Would it look like a single light which became gradually darker the further away it got from the central maximum? Thanks in advance Richard.
  41. M

    Why are there points of zero intensity in the single slit experiment?

    Today in class we went over the single slit experiment, the aim of the lesson was to see that the greater the diffraction angle the lower the intensity. We then looked at a graph where it showed along the x-axis the angle of diffraction and up the y-axis the intensity. There was a decrease in...
  42. N

    Width of central maximum in a single slit diffraction pattern

    hi everybody. I have a problem in finding the width of central maximum in a single slit diffraction pattern. theoritically, we say it is the distance between the two first minima on either sides of the central maxima. i feel this calculation leads to the width of central maxima+half minima on...
  43. D

    Particle through a slit Uncertainty of position

    Homework Statement An air rifle is used to shoot 1.0-g particles at 100 m/s through a hole of diameter 2.0 mm. How far from the rifle must an observer be to see the beam spread by 1.0 cm because of the uncertainty principle? Compare this answer with the diameter of the Universe (2x10^26 m)...
  44. M

    What Happens When We Cover Up One Slit in the Double Slit Experiment?

    My apologies - you are all probably bored to death with these kind of naive questions - but I'd appreciate an answer if someone knows a definite answer. I'm thinking about the original double slit experiment - We fire one particle at a time at two slits and, as long as we don't detect which...
  45. O

    Young's Double Slit Experiment questions

    I am stuck on a question regarding Young's Double Slit Experiment. The two beams in Young's double slit experiment must (a) be parallel (b) have equal intensity (c) come from the same source (d) traverse equal distancesHere are my reasons for my answers. I may be misinterpreting certain parts...
  46. P

    Is There a Flaw in the Double Slit Experiment Theory?

    While researching the double slit experiment and finding that even when only one photon is fired at a time and interference still occurs (so the photon must be traveling through both slits at once) i came up with a possible problem with the theory and wondered if anyone could help me see where...
  47. L

    Help on double slit with different polarizations

    Homework Statement I am taking Young's Double slit expariment setup, however now I am changing the polarization. Below is the typical intensity when both slits have the same polarization, what I need to know is how the intensity graph changes when there is a difference of 90º and 180º in the...
  48. M

    Young's double slit experiment resource

    can u suggest a good site for studying young's double slit experiment involving interference of light coming from two coherent sources online?
  49. Y

    Find Lambda_2 for Double Slit Interference Pattern

    Homework Statement A laser with wavelength d/8 is shining light on a double slit with slit separation d. This results in an interference pattern on a screen a distance L away from the slits. We wish to shine a second laser, with a different wavelength, through the same slits. What is the...
  50. N

    What is the dependence on w of intensity in single slit diffraction?

    Homework Statement Interesting Problem... monochromatic light of wavelength \lambda falls on a slit and is transmitted as t=1 for 0<x<(d/2) t=-1 for (-d/2)<x<0 t=0 otherwise... Define \ w =\ k(d/2) \sin\theta...[most possibly,if I can exactly remember...] Now what should be the...
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