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+// Example 2.10.2  page 2.40
+
+clc;
+clear;
+
+a=50d-6;        //core radius
+lamda=1500d-9;       //operating wavelength
+n1=2.53;     //core refractive index
+n2=1.5;     //cladding refractive index
+
+delta=(n1-n2)/n1;       //computing delta
+v= 2*3.14*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);
+printf("\nNOTE - Calculation error in book. \n Normalized frequency is 477, it is calculated as 47.66");
+
+//Calculation error in book. Normalized frequency is 477, it is calculated as 47.66, hence answers after that are erroneous.
+//answers  in the book
+//normalized frequency = 48.(incorrect)
+//guided modes = 1152.(incorrect)