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+// Example 2.7.8  page 2.28
+
+clc;
+clear;
+
+core_diameter=80d-6;        //core diameter
+delta=1.5/100;      //relative index difference
+lamda=0.85d-6;       //operating wavelength
+n1=1.48;     //core refractive index
+
+a=core_diameter/2;      //computing core radius
+v= 2*%pi*a*n1*sqrt(2*delta)/lamda;      //computing normalized frequency
+M=(v)^2/2;      //computing guided modes
+printf("\nNormalized Frequency is %.1f.\nTotal number of guided modes are %.d.",v,M);
+
+//answer in the book for Guided modes is 2873, deviation of 1.