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+// Example 4.4:core diameter
+clc;
+clear;
+close;
+format('v',4)
+d=0.02;//difference
+n1=1.5;//core refrative index
+m=1000;// number of modes
+h= 1.3;// Wavelenght in micrometers
+a=((h/(%pi*n1))*(m/d)^(1/2));//core diamter in micro meter
+disp(a,"core diameter in micro meter")
+