1.

Which of the following diagram represents the variation of electric field vector with time for a circularly polarised light?

Answer»




Solution :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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