Polarization Definition and 613 Threads

Homework Statement [PLAIN]http://img855.imageshack.us/img855/7899/physicsch3333.png Homework Equations I = 0.5*I_0 I = I_0*cos^2(θ) The Attempt at a Solution I_1 = 0.5*I_0*(cos 50)^2 I_2 = I_1*(cos 70)^2 I_3 = I2*(cos 50)^2 This is my attempt at the problem. This is new to...

Can electron self energy diagram contribute to the vacuum polarization? Or is the question meaningful? What's the exact meaning of vacuum polarization? Does it necessarily involve some charged particle? For example, for the ordinary phi^4 theory, can I identify any diagram that can be called...

I am studying about vikings navigation . Vikings use sunstones (e.g. tourmaline) for navigation in cloudy or foggy days. How can they do that? May be they can describe sun position with polarizer cyristal. If it is like that, What is the relationship between navigation and sun position?

Hi all, [SIZE="1"]( my thought process is confusing me and giving me a headache, so I figured I post my question here...:smile: ) my general question is what happens to the magnetic field of the light after light has been polarized? Does it matter how light has been polarized - going through...

Hi, is a linear polarizer acting like an active element that rotates polarization angle or is it just a passive element? I wonder about this because there is this experiment with three polarizers, where two of them are rotated 90 degree to each other so no light can pass through, and then...

Hi I am trying to find information about the polarization state of a photon after it has been compton scattered. The photon is initially linearly polarized, has a known incoming energy, scattering angle and released energy. Say we ave incoming propagation along the z axis and E field...

Hi! I have a process with multiple feynman diagrams where gluon propagators occur. When I use an axial gauge for the gluon propagator, do I have to use the same n-vector for every propagator? Following this I wonder whether I can use the same n-vector for every polarization sum in axial gauge...

When light is partially reflected by a half-silvered mirror, as in an interferometer, do the reflected and transmitted beams have different polarizations? Is this answer the same for all half-silvered mirrors, or does it depend on the metal coating used and/or the optical properties of the...

I've heard both words used a lot and am having difficulty understanding the two. Is there a difference between them? Thanks in advance

Homework Statement You are standing on the sidewalk, looking toward a shop window. You notice the reflection of a person of your height walking toward you. The reflected light is partially polarized. Is it polarized vertically, horizontally, or somewhere in between? Homework Equations...

In the following article http://books.google.com/books?id=u1DJomI318MC&pg=PA76&lpg=PA76&dq=swallow+goldstone+particle&source=bl&ots=2JysrTHS0c&sig=Qq8r6Cw0zSVD38Vfses5BxGX9UQ&hl=en&ei=1M51Tc3hLse6hAeaxJSJBw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBMQ6AEwAA#v=onepage&q&f=false it...

Hi all, I know that the photon has spin 1. Does its magnetic number, the m in | \ell m \rangle imply its polarization? For instance if m=1, does that mean it has circular polarization? Personally I see no connection between the two. Thanks for any help.

Hi! I can't wrap my head around the formula \textbf{D} = \epsilon \textbf{E} + \textbf{P}. The electric field, \textbf{E}, goes through the dielectric. It polarizes the atoms/molecules, which creates a field going the opposite way, which cancels out at least part of \textbf{E} (right?)...

Homework Statement A demonstration device consists of two parallel metal plates separated by an insulating support. The device is placed on top of a negatively charged van de Graaff generator. In between the plates are several Stryofoam balls covered with metallic paint. a) Describe what...

An apparatus has these properties when measuring a polarized photon: -whenever a linearly polarized photon at angle \vartheta enters apparatus, it displays "2" -whenever a linearly polarized photon at angle \frac{pi}{2}+\vartheta enters apparatus, it displays "3" -for all other polarizations...

Hey all, I'm studying laser-matter interactions and was wondering: Is there any physical meaning to a non-vanishing polarization field with non-trivial constitutive relation but vanishing divergence? (By non-trivial I mean the constitutive equation does not stipulate that the polarization and...

Is hyperfine splitting the same as polarization? If not, what's the difference? Thanks.

hi all im studying polarization, and i want to check if i have the right idea about sky polarization. basically i want to find the position of the sun when i know the angle theta (refer to the attachment) of the sun but doesn't know the exact position. so i look at the portion of the sky...

Hello, I am trying to decompose |(pi/2)+\vartheta> into canonical basis. I have done it for |\vartheta> but i am unsure about what to do with the pi/2. Given |theta> = (cos\vartheta sin\vartheta) I was thinking that pi/2 becomes (0 i) and I would add the two vectors together. Any help would...

I learned that the light is 100% linearly polarized when one looks at the angle shown in pic1. But when taking a photo of a blue sky and also in polarization navigation, it says that we look at the direction of 90 angle from the sun ray cos it's the region of maximum polarization. (pic 2)...

I was trying to search for a similar topic, but as I haven't found one here it goes. Thought experiment: Periodically emitted chain of single photons of non-polarized light is split into two entangled pairs and they are traveling apart from each other. One going toward point A, the other toward...

Homework Statement A half-wave plate is put between an horizontal polarizer and a vertical analyzer, so we have extinction. If the anylizer is rotated clockwise an angle Theta, Which angle do we have to ratate the polarizer to keep the extinction of the light? Homework Equations The...

hi everyone! I would love to learn more about physics. Please help me define the term "net polarization". Thank you very much.

I thought if it`s possible to create a device which would be a something average between capacitor and solar cell.In solar cell we are getting non-uniform charge separation which is then used to produce current with help of low voltage electric field.Current which could be acheived in solar...

I'm trying to understand the meaning of polarization. I know the actual definition, which concerns the directions in which a transverse wave oscillates, as opposed to the direction of propagation. For instance a standing wave on a string is linearly polarized in the vertical direction, meaning...

Homework Statement Long dielectric cylinder of radius R carries a built-in electrostatic polarization P that is linearly proportional to the distance to the axis, P=\alphar, P is directed along the radius-vector r. Cylinder is being rotated around the axis with angular velocity \omega...

Homework Statement The question reads "What is the polarization of the following waves?" 1)\vec E = E_0 [\hat i \cos (\omega t - kz) + \hat j \cos (\omega t - kz + \frac{5 \pi}{4}) ]. 2)\vec E = E_0 [\hat i \cos (\omega t + kz) + \hat j \cos (\omega t + kz - \frac{ \pi}{4}) ]. 3)\vec E =...

i wonder how it's possible that due to reflection from water say of light only perpendicular components remain and others are refracted.

Can anyone explain what is principal section and optic axis of a crystal? Any help wud be highly appreciated. Thank You

light reflected off road surfaces or water surfaces is HORIZONTALLY polarised. Why is this? I would presume therefore that if reflected light is horizontally polarised, light reflected by objects beneath the water is vertically polarised (assuming you see it from under water)

Dear all In case of a material that instantaneous responds to an external applied field is P(r,t)=χE(t) Is the suseptibility then time independent? And if so, how it is possible to derive from the above equation an equation in the frequency domain? Yours

The Polarization of electron.Does this exist ? If not,why? If so,how?

Homework Statement A glass vessel is placed between a pair of crossed HN-50 linear polarizers, and 50% of the natural light incident on the first polarizer is transmitted through the second polarizer. By how much did the sugar solution in the cell rotate the light passed by the first...

Concept check: A Right hand circular polarized wave is having the E vector circulates in the direction of the fingers with the thumb in the direction of wave propagation with its components Ey leading Ex by 90 degrees?

Imagine an unpolarized EM wave going into the z direction. Put a polarizer so that you linearly polarizes the EM wave. I know that the electric field direction of the wave will always be the same. But what about its magnetic field? Is it possible to affect the magnetic field of an EM wave...

Homework Statement Show that the polarization of a material is P=Nqx where x is the displacement between the center of the electron cloud and the atomic nucleus. Homework Equations P=Nqx is given and I went ahead and subbed (q/m) * E[1/(w0^2 - w^2)] for x. The Attempt at a Solution...

Homework Statement a) A beam of light in the air strikes the surface of a smooth piece of plastic having an index of refraction of 1.55 at an angle with the normal of 60 degrees. The incident light has equal component E-field amplitudes parallel and perpendicular to the plane of incidence...

This seems to crop up a few times now, how does it help to trace gravitational radiation?

The vacuum polarization result in QED seems to always be written in a "QED form". I would be interested in seeing it in an old-fashioned classical physics form. Without vacuum polarization the electric potential in a region containing a point charge is of course Q/r. So if the vacuum...

Can anyone direct me to manufacturers/suppliers of the complete setup for the Polarization by Quarter-wave Plates Experiment? I have already found one: PHYWE Systeme (Germany) - http://www.phywe.com/461/pid/26331/Polarisation-durch-Lambda-Viertel-Plaettchen-.htm" , but I need at least two more.

Hi I would like to know how you get from the classical 4-vector polarization to the two component quantum polarization? thank you Mark

so I'm using my laptop outside while also wearing polarized sunglasses. I've only taken up thru physics 2 and it's the summer so ( ) and I'm not mentally on my A game so to speak. But I want to know if my impression here is close to correct or the...

"Polarisation" is defined as the cofinement of the vibrations of the wave in only one plane and the removal of the vibrations in the other perpendicualar plane of the electromagnetic wave. But the e.m. wave is defined as a wave in which the electic vetors are restricted in one plane only where...

*I am using the conventions of circular polarisation according to electrical engineering , not the one used in optics* Let us take a uniform plane TEM wave traveling in +z direction which is composed of two linearly polarised TEM waves , one whose electric field lies in X direction , the other...

Let us consider the Electric field components of a polarized EM wave . [PLAIN]http://www.cdeep.iitb.ac.in/nptel/Electrical%20&%20Comm%20Engg/Transmission%20Lines%20and%20EM%20Waves/graphics/CHAP%204__255.png. Now if we fix the value of z (for convenience take z=0) and consider the locus of...

Hi:smile: I have a question about a circularly polarized wave. Once this wave passes through a linear polarizer - how is the wave intensity changed? Someone has told me that the intensity decreases to its half value, but I’ve read somewhere the intensity is not changed… So… what is the...

Consider a uniform, isotropic , homogeneous solid dielectric slab. We know, induced surface charge=\overline{P}.\widehat{n} and \overline{P} \alpha \overline{E} So, as applied electric field increases, polarization per unit volume increases. which implies that surface...

Suppose we have a fixed coordinatre system (x,y,z). Suppose an antenna is horizonally polarized. Is the orientation of the E field fixed as a function of (x,y,z). Or does it change?

Hi, I'm having difficulty understanding exactly how the reciever loop detects the EM waves in this experiment and I can't find any definitive information online. My understanding is that since EM waves are transverse, to be absorbed by the receiving electrodes, the length of the molecule chains...

I'd like to test my understanding of polarization, concept new to me. I except that the answer to my following question is "no", but I'm not sure and I don't know why it would be so. If I see a circularly (left of right, it doesn't matter) polarized EM wave going to my eyes and I put a...