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Which of the following diagram represents the variation of electric field vector with time for a circularly polarised light?A. B. C. D. |
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Answer» Correct Answer - a When two plane-polarised waves are superimposed then under certain conditions, the resultant light vector rotates with a constant magnitude in a plane perpendicular to the direction of propagation. The tip of the vector traces circle and the light is said to be circularly polarised. To form circularly polarised lighy `E_(x)=E_(0) sin omega t` `E_(y)=E_(0) cos omega t= E_(0) sin (omegat+(pi)/(2))` where `E_(0)` is amplitude. Resultant amplitude `|vec(E )|^(2)=E_(0)+ E_(0) +2E_(0).E_(0) cos. (pi)/(2)` `|vec(E )|=E_(0)sqrt(2)=` constant |
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