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+//Example 9.1: The thickness
+clc;
+clear;
+close;
+format('v',7)
+//given data :
+lamda=589.3*10^-9;// in m
+ne=1.553;
+no=1.544;
+x=(lamda/(4*(ne-no)))*10^3;
+disp(x,"The thickness of the a quarter wave plate,x(mm) = ")