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+//Example 3.8 // Phase retardation
+clc;
+clear;
+//given data :
+Uo=1.5508;//refractive index for O ray
+Ue=1.5418;//refractive index for E ray
+w=5D-7;// wavelength of light used in m
+t=.000032;// thickness of plate in m
+p=2*%pi*(Uo-Ue)*t/w;//phase retardation in radian
+disp(p,"phase retardation in radian")