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To explain polarisation, my book gives an example of a transverse wave in a string, and explains as:

Since each point on the string moves on a straight line, the wave is also referred to as a linearly polarised wave. Further, the string always remains confined to the x-y plane and therefore it is also referred to as a plane polarised wave

The image given is somewhat like this: enter image description here

The definitions for both these terms are different, so it seems to me that they are not same. But I wasn't able to find an example which illustrates the difference between these two.

I found this Quora question, but the answers don't seem convincing.

So what exactly is the difference between a linearly polarised wave and a plane-polarised wave? Because according to me, a linearly polarised wave will oscillate in only one plane.

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    $\begingroup$ I've always taken them as synonymous. The main distinction is between plane [linear] and circularly polarized light, which doesn't oscillate in any one plane. $\endgroup$ – Jonathan Stott Feb 22 at 21:22
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Linearly polarized wave Oscillate in a single plane and the magnitude of electric field vector varies sinusoidally as a function of time.

Circularly polarized wave have their magnitude of electric field vector constant, but their phase change periodically as a function of time.(i.e. the electric field vector rotate periodically as a function of time)

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    $\begingroup$ In your answer, shouldn't it be displacement(or something else) varies sinusoidally as a function of time instead of amplitude varies sinusoidally as a function of time $\endgroup$ – Eagle Feb 23 at 12:03
  • $\begingroup$ I'm sorry. I had written amplitude instead of writing electric field vector. $\endgroup$ – walber97 Feb 24 at 6:37

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