- #1

manjuvenamma

- 102

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I have been spending the last week just to understand the meaning of polarisation of light. I think the books so I far I have seen are not following simple language and are making things complex or I have not seen so far a good book on this subject which simplified the things or perhaps I am not able to understand this completely, I may be missing some fined point.

Most of the books mention that in unpolarised light electric fied vector can be in any plane whereas in polarised light, E vector is restricted to just one plane.

Now let us consider light traveling along the x direction. Since light is A transverse wave, E vector can at most be in YZ plane. True, in the YZ plane, the E vector can be with any orientation, it can be along y axis, it can be along z axis, and it can be a combination of both. So in an unpolarised light, the E vector can be at one moment along y direction, at another it can be along z, and at yet another it can be a combination of both. But still, the E vector is in the YZ plane only. So I find that it is wrong to say that even in UNPOLARISED light, E vector can be in any plane - for example in this case, it can not be along the x axis, it can not be a combination of x and z or in other words, it can not be in the XZ plane - because still the E vector has to be perpendicular to the direction of light propagation. Polarised light can restrict E vector to only along y axis, or z axis or a combination of both.

The gist of my point is that since there can be only one plane perpendicular to a line, (YZ plane for x axis), and E has to be perpendicualr to the direction, E has to be always in the YZ plane.

Am I right? Please clarify. Thanks