What is Interference fringes: Definition and 26 Discussions

In physics, interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude. Constructive and destructive interference result from the interaction of waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency. Interference effects can be observed with all types of waves, for example, light, radio, acoustic, surface water waves, gravity waves, or matter waves. The resulting images or graphs are called interferograms.

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  1. T

    A Mach Zehnder Interferometer Interference fringes issue

    I am trying to make the white light Mach Zehnder Interferometer. After going here and there, I got this small interference pattern. Sadly. Due to the configuration, the beam size of the two arms is not the same ( One arm is equipped with two object lenses, so this arm has a smaller beam size)...
  2. P

    Question about a problem from 'Optics' by Eugene Hecht

    As the value of cos##\theta_{t}## comes out to be greater than 1 so I tried to calculate the minimum value of d the thickness of film which turned out to be approximately 173 nm. Which clearly reflects the fact that the thickness is not enough to produce the fringes. Am I right? Is the question...
  3. dykuma

    I Fabry-Perot Interferometer mirrors

    I am trying to build a Fabry-Perot interferometer to make some narrow band filters, and I was wondering if anyone can go into the specifics of whether there's anything special about the types of mirrors used in construction. I started by trying to see how hard it really is to make one on my...
  4. P

    To find the resultant intensity

    So I thought of calculating the path differences between all the 3 points by taking them in pairs of 2. S1 and S2 S2 and S3 S3 and S1 I got the path differences as λ/3 , λ and 2λ/3 I can now find their phase differences using the equation Cosx=2π/λ* (path difference) Then I can apply the...
  5. S

    Number of interference fringes based on n open slits

    Hi, Is there an equation that gives you the number of interference fringes if you know the light wave length, size and separation of the slits, and length from the slits to the screen?
  6. E

    Interference from a thin film

    Hello, I have a question about interference. I have interference from thin film, i.e. fringes of equal inclination. How I can calculate the radius of sample curvature from the interference pattern? How I can to determine the maximum radius of curvature of the surface at which interference will...
  7. A

    Interference fringe pattern on a thin cut cylinder slice

    A thin slice is cut out of a glass cylinder along a plane parallel to its axis. The slice is placed on a flat glass plate as shown in the figure. The observed interference fringes from this combination shall be ______. My thoughts The thin slice will act as thin film but of half cylindrical...
  8. D

    B Interference fringes, what if you sample them?

    Imagine a standard Young's Slit experiment using photons. We obtain large, distinct interference fringes on a target screen. Then, we embed into the target screen a telescope focused on and capable of resolving the slits. The width of the lens must be greater than about one fringe to obtain...
  9. Y

    Interference Fringes in a Diffraction envelope

    Homework Statement My question is at https://imgur.com/a/lDOUzjY . The de Broglie wavelength of the atoms in question is 45 pm. The distance from the slits to the detection plane is 1.95m. Each slit width is 1 micrometer. The distance between the slits is 8 micrometers. 2. Homework Equations...
  10. malak

    I Michelson interferometer dimensions

    hi i want to design michelson interferometer device for measuring small distance movement i am using laser diode with a wavelength 635 nm and power 3 mw can anyone tell me how can i decide the dimensions (from source to beam splitter , for beam splitter to fixed mirror , from beam splitter to...
  11. sounouhid

    Interference fringes in Absorption spectra

    Hello every one I deposited TiO2 thin layers on glass conductive substrate and then i took there absorption spectra. My question is why do i see interference fringes in the absorption spectra of my samples.
  12. Marcus95

    Fringe Visibility of Sodium Doublet in Michelson interferometer

    Homework Statement The sodium D-lines are a pair of narrow, closely spaced, approximately equal intensity spectral lines with a mean wavelength of approximately 589 nm. A Michelson interferometer is set up to study the D-lines from a sodium lamp. High contrast fringes are seen for zero...
  13. 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
  14. S

    I Spatial interference fringes in Hong-Ou-Mandel

    If we can slightly skew the optics in a HOM setup, so that the phase difference between Beam-1 and Beam-2 varies slowly across one of the detection planes, then would we see dark and bright regions in the cumulative pattern (assuming an array type i.e. spatially resolved detector) ??
  15. I

    Diffraction & Interference - interference fringes per cm

    Homework Statement A thin piece of metal foil of thickness 0.0700 mm separates one end of two pieces of optically flat glass. The top sheet of glass is 12.0 cm long. Light of wavelength 529 nm is normally incident on the glass. How many interference fringes are observed per cm in the reflected...
  16. C

    Solving an Optics Exam Problem: Interference Fringes

    So, I'm about to take an Optics exam, and while I can easily do most of the last years' exam problems, there are some which I cannot solve for different reasons (perhaps some gross oversight?). Yesterday I stumbled upon this: 1. Homework Statement (my own translation from Catalan) We have a...
  17. Q

    Young's fringes experiment, interference fringes

    Homework Statement (this is high school level) The pic below shows interference fringes observe in Young's fringes experiment: Explain why wider slits at the same spacing could produce fringes at the outer edges brighter than some of the fringes nearer the centre. Bear in mind there was a...
  18. C

    Number of interference fringes visible in the central diffraction peak

    Homework Statement How many interference fringes are visible in the central diffraction peak if the ratio of slit separation to slit width is 3.125? Homework Equations d*sin(θ) = m*λ for interference maxima with slit separation d, maxima are at m = 0, 1, 2, 3 ... a*sin(θ) = m*λ for...
  19. S

    Wire radius from interference fringes

    Homework Statement The diameters of fine fibers can be accurately measured using interference patterns. Two optically flat pieces of glass that each have a length L are arranged with the fiber between them, as shown below. The setup is illuminated by monochromatic light, and the resulting...
  20. P

    Interference fringes in Young's experiment

    Homework Statement Explain why wider slits at the same spacing could produce fringes at the outer edges brighter than some of the fringes nearer the centre. Homework Equations fringe spacing = (lamda x D) / slit separation width of central diffraction fringe = ( 2 x lamda x D ) /...
  21. 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...
  22. Y

    Interference fringes between rectangular pieces of glass

    hello again folks, this is the last problem that I haven't gotten in this week's homework. see attached image. Homework Statement Two rectangular pieces of glass (see attached image, I painstakingly made it with a very fussy/crash-ey program) are laid on top of one another on a plane surface...
  23. I

    Determining Mica Thickness Using Interference Fringes

    Homework Statement A thin flake of mica (n= 1.58) is used to cover one slit of a double slit interference arrangement. The central point on the viewing screen is now covered by what had been the 9th bright fringe before the mica was used. What is the thickness of mica if light of wavelength...
  24. K

    Interference fringes with reflected light

    Homework Statement A point source of light (λ = 589 nm) is placed 0.4 mm above the surface of a glass mirror. Interference fringes are observed on a screen 6m away, and the interference is coming from light reflecting off the mirror and light coming directly from the source. Find the...
  25. B

    Does a beam of entangled photons create interference fringes?

    Does a single beam of entangled photons create interference? Hi, This question has come up in an FTL thread going on right now. I've seen two different answers to this question, and I'd be interested if anyone knows the real answer. Here's the setip: shine a laser beam on a crystal which...
  26. maverick280857

    Young's Double Slit Experiment: Interference Fringes with Electrons?

    Hi I just want to know...will interference FRINGES be observed when electrons are used instead of photons (light) in case of Young's Double Slit Experiment? What will be observed? Thanks and cheers Vivek