Word Count : 558

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Consider two plane monochromatic light waves travelling in the same direction along the z–axis. Let the first wave be linearly polarised along the x–axis and the second wave be linearly polarised along the y–axis, such that their planes of polarisation are mutually perpendicular. The electric field components of the two waves can be written as Ex = a cos (ωt – kz) Ey = b cos (ωt – kz + δ) where a and b are the amplitudes of the two waves, ω is the angular frequency, k is the propagation constant and _________ _________ _____ _____ _________ _______ ____ __________ ____ ______ _____.
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