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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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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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Is There a Symmetry Between Diffraction and Reflection? [closed]

I ask this question because I have done several independent experiments that demonstrate that every diffraction has a reflection that is symmetrical to it. When I have done web searches, I see no ...
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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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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 ...
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What is the theory behind Fresnel's half period zones?

I was not convinced by exactly how does this work,why do we need to take concentric spheres around point P and how do those spheres cast circular areas on the wavefront? Why is the radius OM1 and the ...
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Why is a maximum value of current observed in Davison and Germer's experiment?

While studying matter waves, we were discussing Davison and Germer's experiment on electron diffraction when we learnt that a maximum value of current (measuring the intensity of electron diffraction) ...
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Why do we see a rainbow of colors reflected off a CD or DVD?

So, we all know if you shine some light on CD (compact disc) or DVD, you can see all the colors from red to violet. What is bothering me is what is the reason of why do we see the colors on compact ...
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Explanation of problem 2074 in Lim-Yung-Kuo's Problems and solutions in Optics

A pinhole camera consists of a box in which an image is formed on the film plane which is a distance P from a pinhole of diameter d. The object is at a distance L from the pinhole, and light of ...
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Change in position of maximum with the angle of source light in YDSE

One of my friends named Karan, asked me the following question: This question puzzled me for an hour. (an hour is much when your Boards exams are the next day) I want to know how I can accurately ...
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Pump Probe Spectroscopy using in ultrafast diffraction

I am going through currently the experiments on "Ultrafast Diffraction". Would you please explain with some significant degree of conceptual details how I can find the transverse Doppler shift ...
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How loud does a sound need to be to make pressure waves detectable by a camera?

I've seen Veritasium's video that describes how sound can be picked up by a camera by observing small movements of objects sensitive to pressure changes (bag of chips, aluminium foil, paper...). That ...
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Why is the central maxima of single slit diffraction pattern wider than other fringes?

I had answered a question Single Slit Diffraction Experiment, telling why the central maxima is the brightest one, but it asks: Why is the central maximum twice as wide as the others? Now, that is ...
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Origin of XRD Peak Asymmetry

I have been doing an introductory XRD experiment in which we measure the crystal spacing of a simple lattice (LiF) and as usual obtained data for intensity against two theta. Ideally the peaks should ...
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Single Slit Diffraction Experiment

How is possible for an interference pattern to be created from a single wave? Why is the central maximum twice as wide as the others?