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+// Example 5.4:diameter of the core
+clc;
+clear;
+close;
+format('v',4)
+c=3*10^8;//in m/s
+dm=6;//material dispersion in ps nm^-1 km^-1
+h=1.55;//in micro meter
+n1=1.45;//core refrative index
+d=0.005;//differnce
+n2=n1*(1-d);//cladding refrative index
+x=((-dm/(((-n2*d)/(c*h))*10^12))-0.080)/0.549;//
+v=-(sqrt(x)-2.834);//
+d=((v*h)/(%pi*n1*sqrt(2*d)));//diameter in micro meter
+disp(d,"diameter of the core in micro meter")