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A plane eelctromagnetic wave travelling along $+z$ - direction, has its electric field given by $\mathrm{E}_{x}=2 \cos \left({ }^{*} t\right)$ and $\mathrm{E}_{y}=2 \cos \left({ }^{*} t+90^{\circ}\right)$.

The wave is

- linearly polarised
- right circularly polarised
- left circularly polarised
- elliptically polarised