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  4. The string shown above is given an up and down jerk at one end of it while the outer end is fixed at origin. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/45620ab2cf16c7edcfb72494f65f8b59-.png /> If the string always remains confined to the X Y-plane, then it represents

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Q. The string shown above is given an up and down jerk at one end of it while the outer end is fixed at origin.
image
If the string always remains confined to the $X Y$-plane, then it represents

Wave Optics

Solution:

In transverse wave the displacement is in the $y$-direction, it is often referred to as a $y$-polarised wave. 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.