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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 ...

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Did diffraction bend this light more than 90 degrees?

Earlier I asked whether diffraction could bend light more than 90 degrees. earlier question Lambda gave me an answer. He stuck a razor blade into a piece of wood, and he shone a green laser at it, ...
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diffraction using a phone - two central maxima?

okay i actually have two questions. i don't understand why there are two maxima? the set up was something like this - the phone was placed horizontally on the floor and the laser was pointed at a ...
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In diffraction When wavelength is less than slit width then does the scattered light gets absorbed & emitted from the wall or just rebound?

I know that when the slit width is less than that of wavelength then the slit will act as a point source and scatter the light in all directions. But my question is that during the scattering of ...
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Does diffraction pattern depends upon thickness of slit?

I know that diffraction pattern depends upon the width of slit but does the thickness of slit also matters? If so then what happens to the diffraction pattern at variable slit thickness?
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Relationship between aperture function and Fraunhofer diffraction patern

I have read that the Fraunhofer diffraction pattern of a source is the Fourier transform of the aperture, however I have not been able to follow the proofs. All of them seem to demonstrate that the ...
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Can diffraction bend light more than ninety degrees?

Is it possible for light to be diffracted more than ninety degrees? When light diffracts through a narrow slit or pinhole, it travels in all forward directions. The width of the slit determines how ...
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Does diffraction happen from small slit width than its wavelength? [duplicate]

I always learnt in school that diffraction and interference happens if the slit width is of the order of wavelength. But what if the slit width is less than that of wavelength. Does diffraction ...
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Diffraction of electron from single slit using time dependent perturbation theory

While reading about time dependent perturbation theory, I began wondering if it was possible to obtain the diffraction pattern by treating the walls as an infinite potential barrier and the slit as a ...
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Why exactly does diffraction occur?

Why do waves that were traveling in a straight direction change direction when passing through an opening? I thought that the waves (red arrow) when colliding with the wall bounce in the opposite ...
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Why does light diffract when its light beam from a laser is directed at a hair?

Visible light has a short wavelength of 380-750 nm while a human hair range from 17 to 181µm (https://hypertextbook.com/facts/1999/BrianLey.shtml) what is many times larger that the wavelength of a ...
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Diffraction using a phone

I used my phone to create a diffraction pattern and measure the number of pixels along the horizontal. I used the formula in the picture and calculated everything using readings ive added in the ...
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Influence of monochromator entrance slit width on spectral bandwidth

I am working with a Czerny–Turner monchromator (a Bentham TMc300, to be precise), with adjustable entrance and exit slits. I started by acquiring the signal with the slits completely opened, and I got ...
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TEM diffraction analysis- imaging artifact or distorted crystal structure

I've got some "nanobeam" diffraction data from TEM (transmission electron microscope). Analysis is a challenging because I forgot the golden rule... I didn't measure a "standard". Hence, I don't know ...
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Difference between Airy disk and seeing disk

In the diffraction pattern for a circular aperture, instead of just having a circle, we have a central disk and several faint rings around the circle. Does the Airy disk consist of only the central ...
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What is the relation between difraction and energy levels?

Imagine I have an atom in the cold space. The energy gap between its current energy and the next is exactly equals to the photons energy that is about to meet an atom. Atom absorbs photon. All is fine,...
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How to reduce edge diffraction?

I have a simple setup with a diode laser and an object placed in front of it. I want to observe the edge's shadow clearly. However, I get this very annoying effect of diffraction and interference ...
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Diffraction grating produces two central maxima

I was performing a diffraction grating experiment using a grating spectrometer (shown in the picture) and noticed that at zeroth order there were two closely spaced images of the slit. The grating was ...
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Do neutrons that undergo diffraction lose or gain energy? And how much and in what form?

Neutrons that undergo diffraction change direction ... is there a change in the kinetic energy of that neutron? If so, how is that manifested?
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Bragg diffraction form an “inclined” crystal plane: which angle to consider?

Consider Bragg diffraction form an "inclined" crystal plane (i.e. not perpendicular to the normal of the crystal). I was sure that the angle of diffraction $\theta$ in bragg's law must always be ...
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Structure Factor for diffraction patterns

im trying to figure out myself the use of Structure Factor for Diffraction patterns. I have the Structure Factor for a monoatomic lattice $S(\overline G)=\sum_{i=1}^n f e^{\overline G \cdot \...
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Why direct sunlight not used to obtain diffraction pattern on retina?

In an approach to obtain the diffraction pattern on the retina, analogous to a screen, my textbook says, A bulb filament can be used as a source. During daytime, there is another suitable bright ...
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Lissajous of a laser

What is the physical meaning of the Lissajous of a laser that has hit a grating and been diffracted? I.e. if I had some kind of laser source that hits a diffraction grating, what am I seeing if I look ...
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Can Fresnel zone plates be used as collimators

I quite often use the principle in physics that (outside of thermodynamics), all laws of physics are time-reversible. And so, when looking at collimating microwave light, I though that it might be ...
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Diffraction at multiple slit [closed]

In multiple slit diffraction each slit contributes in diffraction phenomenon or only a single slit contributes in diffraction and all n contribute in interference?
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Comparison between X-ray diffraction and slit experiment

Most diagrams regarding X-ray diffraction suggest that after hitting an atom, X-ray would get reflected. But then the method results in an interference pattern which means X-ray get diffracted. I am ...
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Double Slit vs Diffraction Grating Intensity Graph

I had a few questions regarding the intensity graphs of fringe patterns observed when light is shone through a double slit vs a diffraction grating. For a double slit, does the intensity of the ...
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2D diffraction pattern: Benzene (hexagon)

I am currently looking at 2D diffraction pattern. For starters I read: https://www.doitpoms.ac.uk/tlplib/diffraction/diffraction3.php When I have N=6 atomic scatteres in 1D just in a line, it will ...
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Why the effect of diffraction gets weaker as the distance between slits increases?

I was studying the light interference and I heard that in order to get a clear and fancy result the distance between slits has to be comparable to the wavelength not much bigger and I can't understand ...
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Fraunhofer's multiple slits versus atomic scatteres (diffraction)

I am currently busy with studying solid state physics and looking at diffraction theory. http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/mulslid.html#c3 explains Frauenhofer diffraction good. Let'...
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Using Miller indices to determine interference from a particular plane in a crystal lattice

In terms of x-ray diffraction from crystals. I was wondering how you can use the miller indices to determine whether there will be constructive or destructive interference from a particular plane in ...
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Arago spot on terrestrial object

Here is a question that occurred to me considering Fresnel's theory and Arago spot: Is there a bright spot on the surface of the moon in a lunar eclipse? If No Why? If Yes, have we ever make an ...
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Calculating Ionic Radii For Face Centered Cubic Structures

So I have used X-Ray diffraction to measure the different Bragg Angles and intensities for different substances (LiF, KCl, NaCl, RbCl) and I have been given the ionic radii for Chlorine and Fluorine ...
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What's a good textbook to learn about Diffraction in Optics?

I am taking a course in Fundamental of physics for Chemists, Below is the areas I want to learn Franhouofer diffraction Rectangular and circular apertures resolving power Single slit double slit ...
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How can I tell the cubic structure of different crystals?

So I have a couple of crystals I am analysing (LiF RbCl NaCl...) and I have the x ray diffraction patterns for them. How do I determine the different structures of these crystals as I need to ...
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X-Ray Diffraction for Crystal Structures

So I was carrying out an XRD experiment and found that I only got peaks for the (2 0 0) and (4 0 0) lattice structures. I was wondering why there aren't any peaks for the (1 0 0) and (3 0 0) lattice ...
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Diffraction peaks and Miller indices

How do we find out if a diffraction peak is observable using miller-indices?
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What is the intuitive reasoning behind a factor of 4 in the Fraunhofer double-slit intensity equation?

For Fraunhofer diffraction, the intensity of a single-slit scenario is described by the following equation: $I(\theta) = I_{o}\left [\frac{\sin(\frac{\pi a}{\lambda}\sin(\theta))}{\frac{\pi a}{\...
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Confusion with the derivation of the condition for minima in the diffraction with single slit

The usual argument for this is that we divide the slit into two halves, and when we pick a point on the upper half, “there is a point half the width of the slit below the point chosen which generates ...
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What's the reason behind the bending of light around the edges of the body in diffraction phenomenon? [closed]

I am thinking that gravity influence this phenomenon, what about you guys?
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Method of Images for the diffraction integral with Neumann and Dirichlets conditions

In the solution of the wave equation $$[\nabla^2-\frac{1}{v^2} \frac{\partial^2}{\partial t^2}]U=0$$ and consequently the Helmholtz equation $$[\nabla^2+k^2]G(R,\tau)=\delta(R)=\delta(\vec{x}-\vec{...
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Single Slit Diffraction Experiment vs Double Slit Interference Experiment- Formula Derivation

I understand that in the interference pattern of a double slit experiment, if the path difference is an integer multiplied by lambda, we have maxima. If it is 1/2 or 3/2 or 5/2 etc.. we get a minima. ...
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In single slit diffraction what happens to the straight wavefronts which are stopped by the barrier?

I cannot understand what happens to the waves hitting the barrier ...does it get absorbed by barrier? or does it reflect back ?
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Actual explanation of bragg's law and diffraction

When We consider X-ray diffraction by a crystal, We account for the path difference between the rays reflected by the successive lattice planes. However, Light is scattered by the atoms on the lattice ...
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Nature of Huygens' principle

Is Huygens' principle true or is it a geometrical construction to figure out path of light wave? And how does it explain diffraction? I am asking in reference to physical optics. What I want to know ...
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On Superposition In Diffraction

I am a high school student learning Physics. I am currently learning about diffraction of waves, be it water waves, light waves each, in systems where there are 2 slits for it to diffract through. I ...
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What causes Lorentzian broadening of X-ray diffraction peaks?

In X-ray diffraction, the pseudo-Voigt model is a combination of Gaussian and Lorentzian distributions, and is often used to model peaks. The form of the peak is often described as $V(x)$ = (1-$\...
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Space-time curvature VS light diffraction

Thanks to YouTube suggestions I saw some videos. One is about the bright spot in the middle of a coin shadow, which is called the Poisson spot, that is related to light diffraction. (https://youtu....
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Why we get diffraction minimum at $\sin \theta = \frac{\lambda}{d} $

One of the possible explanation of this is: If we have a $2k$ rays and number them between $1$ and $2k$, $1$ ray will destruct $k$, because the additional distance of ray $k$ is $\frac{d}{2} \sin \...
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What is the physical reasoning behind the mathematical derivation of double-slit interference pattern and single-slit diffraction pattern?

Why is it that there are two different equations for the minima of a single slit diffraction pattern and a double slit interference pattern? In the double slit experiment, the two slits act as two ...
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Why $n=1$ in Bragg' s condition?

While studying XRD pattern , most of the time we use n= 1 in the Bragg equation. Why we prefer n=1? Why don't we use n = 2 or 3 ?