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Questions tagged [diffraction]

Diffraction is defined as the bending or flaring of light around the corners of an obstacle or aperture into the region of geometrical shadow of the obstacle. This flaring is consistent with the spreading of wavelets in the Huygens construction. Diffraction occurs for waves of all types, not just light.

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Diffraction grating angle

Why have they taken the angle to be 90 degrees? And why have they used only one of the wavelengths provided? can you explain in layman terms?
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Confusion of Euler form summation in intensity expressions

In one of the questions I asked before, the members here kindly gave me this link How to derive the intensity formula of a diffraction grating??. As much as I get the motivation behind the answer for ...
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$N-$ slit generalization for intensity patterns

I have been studying the intensity patterns of single slit, double slit and triple slits. Each intensity pattern depending on how you add the individual electric field components at a point on the ...
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What effect will moving one light source closer to the screen have on the diffraction pattern of two coherent light sources?

Say that you have two coherent light sources to begin with, each the same distance away from a screen, but then, you move one of the light sources closer to the screen by a fraction of the wavelength ...
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The effect of wavelength on diffraction

I have learnt that the closer the slit width is to a wavelength source, the more it diffracts as it passes through it. Why is this the case? Also, how does this relate to low frequency sounds being ...
I was wondering whether there are differences between the terms phase variation and phase deviation of a wave. If we have an equation of a wave which is incident on a plane given as : E(x,t) =Eo \... 0answers 15 views X-ray diffraction by Debye-Scherrer Method I was watching lectures by Dr. Steve Simon(Oxford) at Stanford. He said that in a Debye-Scherrer Method for measuring X-ray diffraction, you should calculate d(spacing between lattice planes) by d=\... 1answer 36 views Why x-ray diffraction occur only in forward direction? When x-ray falls on an atom,the atom scatters it in all 4pi solid angles. In case of a crystal also the atoms sitting in different planes scatter light in all 4pi direction. But when it comes to Bragg ... 0answers 18 views Monochromatic light diffraction what causes the blind spots between the other light spots in a laser diffraction ? is there any GIF that explains the behavior of a light wave entering the breach till forming the light spot pattern ? 0answers 49 views In Young's double slit experiment, does the intensity of light depend on the slit width? Here's a question I just came around In YDSE, the intensity of the maxima is I.If the width of each slit is doubled, what will be the intensity of maxima now ? here, we assume that no diffraction is ... 0answers 34 views Variation of phase across the wavefront I have been going through the theory of diffraction of radio waves when passing through the ionosphere, when I came across the following statement: the amplitude of the wave when it emerges from ... 0answers 90 views Effect of metal disks on diffraction of light [closed] Recently, I started to go deeper into physics. I don't speak English well, so I'm sorry. This experiment was carried out in Hungary 25 years ago. The measurement results were not accepted by the ... 0answers 18 views Littrow Configuration Spectrometer I have been studying the design of a spectrometer using a transmission diffraction grating. I stumbled upon this link, https://ibsen.com/technology/spectrometer-design-guide/. It explains a ... 0answers 39 views Static Structure Factor I know that static structure factor can be calculated from molecular simulation or X-ray diffraction. I would like to ask that if there is a way I can also calculate static structure factor given a ... 1answer 37 views Double slit diffraction and interference patterns i'm a highschool physics student trying to understand diffraction and interference etc. I'm confused about this (in the context of the double slit experiment): if an underlying interference pattern ... 2answers 46 views Single slit then double slit [closed] I am quite aware of what the intensity patterns will be on the screen for a single slit and a double slit experiment. However I have a hard time grasping the consequence of the intensity patterns when ... 0answers 24 views Location of diffraction pattern on the image plane/detector plane I am trying to make a spectrometer. At the moment, I have an optical setup consisting of a laser, diffraction grating and a screen/detector in a straight line. I am trying to understand how to ... 2answers 131 views Diffraction: What actually happens in the slit I’m not a physicist but a curious reader, and I’m trying to understand the slit experiment it all makes sense if I accept that the slit itself has no active affect ... can any one explain what ... 1answer 40 views Is all light of the same intensity? In an experiment like the Young's Double Slit, if you shine any different wavelength of light, will the maxima peaks be of the same height? How is the intensity of light changed? 0answers 22 views Why exactly are the diffraction and elastic coherent scattering of light different things? In solving diffraction problems, as far as I know, physicists treat the distribution of optical properties of the obstacle with wave equation, applying different simplifications (such as Fraunhofer ... 1answer 29 views Formula for blurring out a grid of holes Place a camera lens with focal length f_l mm and camera sensor size w mm and h mm behind an ... 0answers 23 views Rayleigh criterion: angular or spatial resolution? The Rayleigh criterion sets the fundamental limit for what features an optical system can resolve. Formally, the criterion is defined for some wavelength \lambda in the case of a uniformly-... 1answer 24 views Can iridescence be produced with a monochromatic light source? An iridescent substance appears to change color based upon the angle of observation, and I assume this is because the substance reflects different frequencies of light at different angles. My ... 4answers 2k views Reverse of diffraction Can we arrange a practical in such a way that the dark and bright bands in diffraction grating be allowed to pass through the same slit to get the original light (i.e the incident light before ... 1answer 11 views Does integrating over a reflection surface disregard diffraction Let g(R, \theta, \phi) be the reflectivity of a surface such that g=0 where the surface is not present or not in the line of sight. Let f(t) be a wave emitted from the origin at t = 0. Further ... 1answer 70 views Diffraction pattern of X-ray and electron Electron diffraction is used to study about wave - particle duality of matter. A beam of electrons directed at a single crystal produced a diffraction pattern like an X-ray diffraction pattern. I ... 2answers 14 views Optics - Polarization's Effect in a Blazed Reflective Diffraction Grating I'm doing an undergraduate research project, part of which requires me to build an extended cavity diode laser (ECDL). The new diode mounts take receive the diode in a 90 degree rotation of the old ... 2answers 57 views Possible to weaken single-slit diffraction? Without changing the source of the waves or width of the slit, is it possible to make the electromagnetic waves passing a small slit spread less by changing some other aspects of the slit such as ... 1answer 70 views Diffraction pattern vs Interference pattern I am not confused with difference between Young's double slit experiment and diffraction. In Young's double slit experiment, the interference pattern is bright fringes separated evenly with ... 2answers 73 views Why do we take long, narrow slits for diffraction? we take long, narrow slits for diffraction, I am convinced that the slit should be narrow for the diffraction to occur as the waves spread out vertically, but I can not understand why do we take long ... 2answers 73 views How can a bright fringe be not as bright as a dark fringe in YDSE? [closed] The book says that the last bright fringe in the interference pattern within the central maxima in the diffraction envelope can not be seen as it cannot be as bright as the diffraction dark fringe. ... 1answer 82 views How does the intensity not change when the width of the slit changes in single slit diffraction The picture in the book by Resnick and Halliday shows as the width of the slit increases the width of the central maximum decreases and becomes flat as the slit width decreases, my concern is when ... 0answers 30 views DNA diffraction/ with spring, high school experiment Whilst conducting a high school experiment with a laser and a spring I noticed something peculiar as I extended the spring the x pattern angle widened and as the spaces between the spring shortened, ... 1answer 62 views Is the Compton effect observed during regular x-ray diffraction? Here we have the standard set up to observe the compton effect. From what I understand, due to the particle like nature of light, when the x ray photons collide with the electrons in the scatterer ... 1answer 42 views Can faster sampling frequency solve the x-ray diffraction phase problem? In the x-ray diffraction, only the intensity the light that hits the detector is captured while the phase of the light is not determined. The energy flux of the light is the Poynting vector. For a ... 1answer 42 views Can we apply the concept of 'fresnel number' to multiple slits? As I know, there is a concept of 'fresnel number (NF)' to represent the level of diffraction. Normally, we can call Fresnel diffraction if the NF is much smaller than 1, and Fraunhofer diffraction if ... 0answers 22 views Diffraction by induced quadrupoles This is a very interesting problem that I've been struggling to solve for a week, so I decided to ask for some orientation, as I think it could also be of interest for the community. Let's consider a ... 1answer 67 views Physics Young's Double Slit Problem In a Young's Double Slit experiment, the separation of four bright fringes is 2.5\ mm, the wavelength of light used is 6.2 \cdot 10^{-7}\ m. If the distance from the slits to the screen is 80\ cm... 0answers 42 views Intensity of x-ray difracted on a crystal Suppose we have an X-ray tube R which emits X-rays of intensity I_s(\lambda), obeying the Kramers' law. The X-rays then come to the cubic crystal K under the angle \vartheta, where diffraction ... 0answers 30 views Why does a Bahtinov mask work? I understand how a Bahtinov mask works: As you achieve better focus, the diffraction spikes start to align. What I can't work out is why the diffraction spikes move as the focus changes. I know the ... 0answers 19 views How can I focus a laser in the gap between two slits? I’m trying to focus a green laser in between two slits. The slit width is 0.2mm and gap between the slits is also 0.2mm. I measured the laser’s minimum spot size. It’s elliptical with major and minor ... 1answer 35 views Why are experimental atomic scale images black and white? XRay diffraction patterns are black and white. So are scanning electron microscope (SEM) images. Why is this so? At the time of measurement at the atomic level, do the atoms fail to absorb or emit ... 1answer 117 views Feynman Lectures Vol. 1: error in the formula for resolving power? In chapter 27 of Feynman Lectures on Physics Vol. 1, section 7 on resolving power, Feynman states the rule for optical resolution: two different point sources can be resolved only if one source is ... 2answers 86 views Why do the two slits of a double slit experiment not make light coherent and create an interference pattern if monochromatic light is passed through? [duplicate] If a narrow slit makes monochromatic light coherent, why is light required to pass through the single slit before the double slits in Young's experiment? Wouldn't the double slits individually make ... 1answer 40 views Holographic “lens” - controlling light diffraction angles with silver halide film I'm trying to develop a way to control the "exit angle" (diffraction angle) of a monochromatic light source. For example: taking a laser; spreading the beam; and directing the light at a piece of ... 1answer 142 views Diffraction of White light: Why is violet on the inside When white light is passed through a diffraction grating, an interference pattern is observed. The center will be white as the path length is equidistant however the edges will be rainbows. What I don'... 0answers 15 views What frequency range can be tolerated with Young's fringes? (Problem 9.4, Brooker, Modern Optics) I am having problems with part 2 but provided part 1 for context - I believe I have part 1 correct but could be mistaken. Let a Young-slits apparatus have slits separated by d. Let the incoming light ... 2answers 181 views Angular width of first maximum in diffraction grating Often in my book they have referenced the fact that as N (the number of slits) becomes very large, the angular width of the first maxima in a diffraction grating can be approximated as follows: I am ... 2answers 47 views Help understanding resolution between two light beams Today I read that if you have two light beams with a wavelength difference equal to \Delta\lambda to resolve the two into two disjoint spots, the following must be true: Where N is the number of ...
In the notes I have, they have a diffraction grating with $2N + 1$ slits, a slit width of $2a$ and a slit spacing of $d$. They then say that the equation for the diffraction intensity pattern is given ...