These molecules were arranged in the substance with their long axes Nonspherical molecules, longer than they are wide, and suppose that Suppose that we had some material which consisted of long, Linearly polarized in one direction and linearly polarized inĪnother. Substances for which the index of refraction is different for light To find out whether the light is polarized or not.Īnother interesting effect of polarization is the fact that there are We see from the definition, light is unpolarized only if we are unable None of the interferenceĮffects of polarization would show up with unpolarized light. The effects of the polarization average out. Than we can detect it, then we call the light unpolarized, because all Vibrates in one direction, then in another, the polarization isĬonstantly changing. Light is not absolutely monochromatic, or if the $x$- and $y$-phasesĪre not kept perfectly together, so that the electric vector first Know that it must vibrate in one or another of these ellipses? If the Now how can the light be unpolarized when we Light, which covers everything except for the case of We have considered linearly, circularly, and elliptically polarized However, in some books on optics the opposite conventions are used, so Other particles in physics which exhibit polarization (e.g., electrons). Polarization is consistent with that which is used today for all the Our convention for labeling left-hand and right-hand circular In both cases the light is coming out of the 33–2(c) shows left-handĬircular polarization. Figure 33–2(g) illustrates right-handĬircular polarization, and Fig. Us, goes around in a counterclockwise direction, we call it right-handĬircular polarization. The electric field vector travels around a circle, we haveĮlectric vector, when we look at it as the light comes straight toward When the end of the electric field vector travels in anĮllipse, the light is elliptically polarized. (sometimes called plane polarized) when the electric field oscillates Of $\pi$) motion in a circle corresponds to equal amplitudes with a phaseĭifference of $90^\circ$ (or any odd integral multiple of $\pi/2$). The motion in a straight line is a particular caseĬorresponding to a phase difference of zero (or an integral multiple The general result is that the electric vector movesĪround an ellipse. 33–2 for a variety ofĪngles between the phase of the $x$-vibration and that of the The superposition of $x$- and $y$-vibrations which are not Oscillations in which the $x$- and $y$-directions are not in the General motion of the ball is motion in an ellipse, which corresponds to The $y$-vibrations reach their maxima and minima at the same time, the In each instance, since the $x$-vibrations and Oscillations of the electric field vector illustrated inįig. These motions of the ball are analogous to the The $x$-axis or the $y$-axis, or along any straight line in the By selecting the proper initial displacementĪnd initial velocity, we can set the ball in oscillation along either If we imagine horizontal $x$-Īnd $y$-coordinates with their origin at the rest position of theīall, the ball can swing in either the $x$- or $y$-direction with the If we hang a ball from a support byĪ long string, so that it can swing freely in a horizontal plane, it When the $x$-vibration and the $y$-vibration are not in phase, theĮlectric field vector moves around in an ellipse, and we can Mike The Feynman Lectures on Physics New Millennium Edition Your time and consideration are greatly appreciated. So, if you can, after enabling javascript, clearing the cache and disabling extensions, please open your browser's javascript console, load the page above, and if this generates any messages (particularly errors or warnings) on the console, then please make a copy (text or screenshot) of those messages and send them with the above-listed information to the email address given below.īy sending us information you will be helping not only yourself, but others who may be having similar problems accessing the online edition of The Feynman Lectures on Physics. This type of problem is rare, and there's a good chance it can be fixed if we have some clues about the cause. which operating system you are using (including version #).which browser you are using (including version #).If it does not open, or only shows you this message again, then please let us know: So, please try the following: make sure javascript is enabled, clear your browser cache (at least of files from ), turn off your browser extensions, and open this page: If you use an ad blocker it may be preventing our pages from downloading necessary resources. If you have have visited this website previously it's possible you may have a mixture of incompatible files (.js. In order to read the online edition of The Feynman Lectures on Physics, javascript must be supported by your browser and enabled. There are several reasons you might be seeing this page.
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