# What is Fringes: Definition and 100 Discussions

The Fringes of the Fleet is a booklet written in 1915 by Rudyard Kipling (1865–1936). The booklet contains essays and poems about nautical subjects in World War I.
It is also the title of a song-cycle written in 1917 with music by the English composer Edward Elgar and lyrics from poems in Kipling's booklet.

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1. ### A Unknown large linewidth of the fringes of a cavity

Hello! I am building a bow-tie cavity and for some reason the peaks I see when scanning the laser frequency are extremely wide and with a very long tail to the right. However, if I put a 50 Ohm resistance in between the BNC cable from the diode and the oscilloscope (using a BNC T connector) the...
2. ### Number of bright fringes given by diffraction grating on a screen

(1) In the book I am using the separation of bright fringes is indicated as being ##\Delta y=\frac{\lambda}{d}##, where ##d## is the separation of the slits so on a screen of width ##W## I would see ##\frac{W}{\frac{\lambda}{\frac{1}{N}}}## bright fringes. I don't see why the text of the...
3. ### B Number of fringes in a 2-slit diffraction pattern

When looking at a diffraction pattern made by two slits, and trying to calculate wavelength, what do we count as fringes? For example, in this picture are there five total fringes or, like, 25? I've been trying to set up a lab for my high school physics 2 class and the math says that every...
4. ### Young's double-slit experiment - Bright fringes occurring

I think the answer is E because each bright fringe is differed by a wavelength, in other words, one wavelength is equal to 2π. (For example, the first bright fringe is d * Δy/L = 1*λ.)
5. ### Understanding Wavelengths and Fringes: A Guide

I think the answer is E because each bright fringe is differed by a wavelength, in other words, one wavelength is equal to 2π. (For example, the first bright fringe is d * Δy/L = 1*λ.)
6. ### Calculating the distance between fringes in an alternate universe

It's straightforward to calculate the wavelength of the balls which is 20,000m. I said that because this is the case and then the pattern must not be a an interference pattern as with electrons. The second question relies on the formula d = n(lambda)/2. Setting n = 1 for two golf balls will...
7. ### Measuring the Distance between the Fringes of a Diffraction Grating

I have been preparing for a physics practical on diffraction. More specifically, we will use a CD as a transmission grating (by peeling off the reflective layer), and measure the distance between the fringes for a specific distance between the CD and the viewing wall. However, it is unclear...
8. ### Circular fringes in a Fabry-Perot Interferometer

Fabry-Perot Interferometer contains an etalon(an optical cavity created by 2 partially reflective mirrors placed parallel to each other separated by a small distance). When light enters the etalon it gets reflected back and forth between both the mirrors, being partially reflective, every time...

10. ### 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?
11. ### I Double slit displaying anti-fringes?

The conventional Young double slit experiment displays the interference fringes with the first intensity maxima at the center of the detection screen ('center' means aligned with the center between two slits of equal aperture). These are simply called 'fringes'. However, I'm wondering if and how...
12. ### 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...
13. ### 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...
14. ### Wavelengths: Length between 2nd-order fringes

Homework Statement Light of wavelenghs 4.80x10^2 nm and 632nm passes through two slits 0.52 mm apart. How far apart are the second-order fringes on a screen 1.6m away? λ₁ = 4.80x10^2 nm = 4.80x10^-7m λ₂ = 6.32x10^-7m d = 0.52mm = 5.2x10^-4m n = 2 L = 1.6 Homework Equations (Maxima/Bright)...
15. ### I Young's double slit: why fringes gets dimmer and inconsistent?

Hi all! In Young's double slit experiment, there are two things I cannot explain. Any help is appreciated! The first one is why the bright fringes get dimmer as you get further from the central/brightest spot. My theory, after looking in the two books I have, is that each single slit decreases...
16. ### I Fringes observed between the fingers

In Feynman lectures on physics 26 Optics 5 --- Then put two fingers in front of one eye, so as to look through the crack, and squeeze the light to zero very gently. ... Also you will notice, if you are very careful, side maxima, a lot of fringes along the edges too. Furthermore, the whole thing...
17. ### Distance between adjacent fringes

Homework Statement Light from a laser with a wavelength of 760nm is directed at diffraction grating of 1500 lines/cm. If the diffraction grating is located 15.m from the screen, calculate the distance between adjacent bring fringes. Homework Equations ∆y = L λ/d The Attempt at a Solution...
18. ### Inteference Fringes of Double Slit Experiment in Water

Homework Statement Suppose a double-slit experiment is immersed in water (with an index of refraction of 1.33). When in the water, what happens to the interference fringes? Homework Equations λ = λ0 / n y = (λmL) / d d = distance between slits L = distance to viewing screen n = index of...
19. ### What is the Number of Fringes in a YDSE with Given Parameters?

Homework Statement Find number of fringes separated by 1 cm on a screen at a distance of 2mm from slits which are 0.2mm apart from each other.The wavelength of light used is 500nm. Homework Equations The Attempt at a Solution I really don't know any way to solve it.I have tried putting unit...
20. ### 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.
21. ### 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
22. ### Maximum Bright Fringes for Double Slit Experiment

Homework Statement At most, how many bright fringes can be formed on either side of the central bright fringe when light of wavelength 644 nm falls on a double slit whose slit separation is 3.64 × 10-6 m? Homework Equations m=dsintheta/lamdbaThe Attempt at a Solution...
23. ### Ramsey fringes - free oscillations

i´ve got a question concerning Ramsey interferometry and fringes. Consindering the case we have 2 pi/2 pulses as usual. For this case it is easy to calculate the mean value of the Bloch component w by applying a rotation matrix, say rotating around the Bloch component v. Then applying a rotation...
24. ### Michelson interferometer moves and bright fringes disappear

Homework Statement In a Michelson interferometer, as one of the mirrors is moved, 250 bright fringes disappear into the centre. If the light wavelength was 800nm, how far was the mirror moved? Homework EquationsThe Attempt at a Solution My logic is: If we were to count how many passing bright...
25. ### Why does diffracted white light have a white central fringe?

Hey everybody, Homework Statement : [/B] I came across a question discussing Young's Double Slit interference and was wondering how come when we diffract white light through the slits it gives us a central antinodal fringe that is also white? The question itself came in parts firstly...
26. ### 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) ??
27. ### Distance between fringes in an interference pattern?

For the sake of simplicity let's suppose I'm talking about the diffraction of light through one slit. Are the distances between any two consecutive fringes (apart from the central maximum) exactly equal? Assuming the wavelength, slit width, and distance between slit and screen do not change...
28. ### The # of bright fringes in a double slit with finite width?

Homework Statement Laser light with a wavelength 633 nm is used to illuminate two slits separated by 0.125 mm. The width of each slit is 0.0150 mm. Assuming that only fringes between the first minima in the pattern are counted, how many bright fringes are visible? lambda = 633nm d = 0.125mm w=...
29. ### 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...
30. ### Calculating Fringe Positions in Two-Slit Interference Patterns

Homework Statement [/B] Light passing through a two-slit grating makes a pattern on a screen located 500 mm away. In this pattern, the fifth-order dark fringe is 45.0 mm from the central bright fringe. How far from the central bright fringe is the third-order bright fringe? Homework Equations...
31. ### What are localised and non localised fringes?

what does it mean by localisation of fringes?
32. ### 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...
33. ### Light problem -- diffraction grating distance between adjacent bright fringes

Homework Statement Light from a laser with a wavelength of 760 nm is directed at a diffraction grating of 1500 lines/cm. If the diffraction grating is located 1.5 m from the screen, calculate the distance between adjacent bright fringes. Homework Equations Δx = Lλ / d 760 nm = 7.60 x 10^-7 m...
34. Y

### How does the dark and bright fringes form ?

When there is a water wave in a ripple tank( not involving any interference experiment ) there will be a pattern on the bottom of the ripple tank , that is the the dark and bright fringes. How does the bright fringes and dark fringes form for only water waves experiment in ripple tanks ? It...
35. ### A problem about Fresnel fringes of electron microscopy

My question is simple: Why do the Fresnel fringes at the edge of a hole in a reticulated carbon film become larger and more widely spaced when the defocus is increased? This occurs whether you are over focused or under focused, right? But why?
36. ### Modifying Slit Separation for Seeing Fringes Again | 65 Characters

Homework Statement i can't understand part b ii) , i assume the resolving power of eyes is constant . so when the slit separation increase , the wavelength of the light should be decreased to keep the tetha ( here , tetha = resloving power of eyes in radian )...But the book give different ideas...
37. ### Counting Dark Fringes: Measurement & Order

Dark spots are measured on a screen at +xm, +ym and +zm where z>y>x from the central axis. since dark fringes are where (m+0.5)λ, would it be right for me to state that the dark spot z has an order of 3.5?
38. ### Michelson interferometer fringes

Since 2 splitted beams meet at ONE spot later on, we have just one beam which flows to the detector, therefore I expect to see just one light spot, where the BRIGHTNESS is changing depending on at which phase 2 beams meet. Pattern with fringes happens when we have multiple sources, like Young's...
39. ### Fringes from Different Interfering Wavelengths

Homework Statement The questions is... Coherent light with wavelength 597nm passes through two very narrow slits, and the interference pattern is observed on a screen a distance of 3.00 m from the slits. The first-order bright fringe is a distance of 4.84 mm from the center of the central...
40. ### Tridiagonal matrix with fringes

Hello everyone! I am trying to solve a large system of linear equations. The form of the matrix is A = T + F. T is basically a tridiagonal matrix and F has two "lines" of numbers running parallel to the diagonal but at some distance. Basically like this one, but not symmetric, nor is it...
41. ### Calculating (t1-t2): Three Bright Fringes on Inclined Glass Plates

Homework Statement One glass plate sits flat and another is above it inclined on an angle(shown on diagram provided). monochromatic λ light shines on it. The fringes are spaced p apart, and the bottom plate is length d. Between t1 and t2 there are three bright fringes. What is (t1-t2) ...
42. ### Calculating Intensity of Fringes with Young's Formula | Fringe Width Calculation

Hi all I am looking for the intensity of the fringes on the screen behind two slits with a given width. I thought it would be easy to find with google but no.
43. ### Calculating number of fringes

Question are in paint doc. My answer is in red... I believe the answer is 4 and not 5. Please someone let me know if I'm correct.
44. ### 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?
45. ### Archived Finding the distance between two fringes in a double slit experiment

Homework Statement Blue light of wavelength 400 nm passes through two slits which are a distance d = 1×10−4 m apart. This produces a double slit pattern on a screen L = 12 m away. (The screen is parallel to the plane of the two slits.) If the central bright fringe is denoted the “m=0...
46. ### 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...
47. ### Diffraction and intensity of fringes

I'm not sure if I've understood my textbook correctly. Can you tell me if my current understanding is correct: - in a single slit diffraction there's a wide central fringe which is twice as wide as all the other outer fringes - if we had a double slit diffraction instead of a single slit...
48. ### Finding the Distance between fringes given different wavelengths

Homework Statement See attached image Homework Equations single wavelength mλ=dsin(θ) diffraction grating: d*(sinθi+sinθm)=mλ y/L = sinθ The Attempt at a Solution red = 656 nm blue = 486 nm L = 1.7 m I really do not know what to do. I tried 656-486 = 170 nm so...
49. ### Order of Dark Fringes: Understanding Interference Patterns

See attachment please. After that, please point out, the order of the dark fringes. I mean I can't see where is m=0 dark fringe? Where to start? I want to know so I can know that radius enclosed by each fringe. Thanks.
50. ### Find the number of fringes that will shift in young's double slit experiment

Homework Statement Monochromatic light of wavelength 600nm is used in a young's 'double slit experiment . One of the slits is covered with a thin transparent layer (1.8 * 10^-9m ) made of a material of refractive index n(1.6). How many fringes will shift due to the introduction of the...