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4. Two coherent beams having parallel electric fields are described by
TT
E₁ = 5 cos(ks₁ · wt + 3)
E₂ = 3 cos
+7)
(ks₂ - wt+
With amplitudes in kV/m. the beams interfere at a point P where the
phase difference due to path is π/4. At the point of superposition,
calculate the net irradiance.

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