Discussion
A linearly polarised wave is one in which the electric field vector
Answer: C
Correct answer: stays along one fixed direction as the wave advances
Linear polarisation means the electric field oscillates along a single fixed line in the plane transverse to propagation; its magnitude varies sinusoidally and reverses sign, but its direction never rotates. Circular and elliptical polarisation arise when two orthogonal components of unequal phase combine, so that the tip of the vector traces a circle or an ellipse instead.
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