When the optical path-length becomes large in long propagation through random media, then we have to consider the effect of depolarization of EM waves. In this paper, to solve this depolarization problem, we have derived an integral equation using the dyadic Green's function on the assumption that there exists a random medium screen of which the dielectric constant is fluctuating randomly, and modified the integral equation on the assumption that the observation point is very far from the screen. Form this modified integral equation, the analytic expression of the depolarized EM wave has been given by using the perturbation method.
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