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+clc;
+clear;
+myu_e=1.553 //refractive index
+myu_0=1.542 //refractive index
+lambda=5.5*10^-5//wavelength in m
+
+//calculation for minimum thickness i.e half wave plate
+d=lambda/(2*(myu_e-myu_0))
+
+mprintf("The thickness of the plate is = %1.1e m",d)
+