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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Single slit then double slit

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 ...
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Single slit or double slit [on hold]

Are there any mathematically rigorous problems on single slit diffraction problems that I could read about, that concerns itself with more geometric optics as well? All the examples in my book are so ...
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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 ...
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Confusion regarding the reasoning for why constructive interference is hard to determine in Single-Slit Experiment

We know that the location of dark spots in Single-Slit experiment is given by the following equation: $$m\lambda = d\sin\theta$$ Where $m = 1,2...$ $d$ is the width of the slit and $\theta$ is the ...
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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 ...
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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?
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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 ...
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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 ...
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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-...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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. ...
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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 ...
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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, ...
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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 ...
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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 ...
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1answer
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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 ...
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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 ...
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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 $80\ cm$...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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'...
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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 ...
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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 ...
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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 ...
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How to derive the intensity formula of a diffraction grating?

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 ...
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Scattering on crystals beyond Ewald and Bragg

So I whenever we consider the diffraction and scatting using crystals, powders, basically anything crystalline in the lab using X-rays we get a bunch of theories and models. The most simple one would ...
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What is the reason behind diffraction of light?

What is the actual reason behind diffraction of light? I want to know how is the phenomenon diffraction explained theoretically in physics (best if the discussion limits itself to classical physics). ...
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What is the physical meaning of Green's theorem and Green's identities?

During the derivation of Kirchhoff and Fresnel Diffraction integral, many lectures and websites I found online pretty much follows the exact same steps from Goodman(Introduction to Fourier optics) in ...
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Angles of diffraction orders in hexagonal grating

I have a situation of normal incidence where I need to calculate the the angles of different diffraction orders from a hexagonal grating. How do you go about deriving the grating equation for this ...
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Diffraction Efficiencies and Evanescent Waves

For a binary phase grating (duty cycle = 0.5, phase contrast = $\pi$), the diffraction efficiency $\eta_q$ for an odd diffraction order $q$ is given by $\eta_q = \left( \frac{2}{\pi q} \right)^2$ (see ...
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A confusion regarding the single slit interference

So I came across the single slit interference in which a parallel beam of light is passed through narrow slit as shown in figure below. (I made only 3 rays in figure for simplicity there are actually ...
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Intensity pattern in a single-slit diffraction

In a single-slit diffraction, what happens to the intensity pattern if the slit width becomes narrower and narrower?
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What is “quantized momentum transfer”, and can it account for the double-slit experiment?

In https://www.sciencedirect.com/science/article/pii/S0378437109010401, the author claims that the interference pattern obtained in the double-slit experiment does not need a wave description of ...
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Question about the integrity of a TEM analysis result

I have a question concerning the integrity of a particular TEM analysis that was done. The specimen was household dust that may or may not have contained asbestos, and was sampled with Ghost Wipes, ...
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Elastic X-ray diffraction: Where does the Photon Momentum go to?

lately I was discussing the following situation. Let's suppose you are doing X-Ray diffraction experiments on a crystal. So what you basically do is shooting a high energy photon with a wave vector $k$...
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Question about the diffraction of electrons

This question concerns the diagram on the left. This is the set up. My question is that, why is collector current not an increasing function of the KE of the electrons? I can understand the graph ...
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How is Bragg's Law related to the Phenomenon of Diffraction?

As far as I understand, bragg reflections is a geometric result which says that parallel x ray beams that are incident on atomic planes will constructively interfere at specific angles. Where does ...
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Is it possible to make a source of light such that it only emits one ray of light?

I am just a high school student trying to self study, so please excuse me if you find the question silly. I don't really need to explain my question.I am just asking if we can make a source of light ...