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+
+// Example 2.7.13  page 2.31
+
+clc;
+clear;
+
+n1=1.447;       //refractive index of core
+n2=1.442;       //refractive index of cladding
+lamda=1.3d-6;       //Wavelength
+a=3.6d-6;        //core radius
+
+NA=sqrt(n1^2 - n2^2);       //computing Numerical aperture
+v= 2*%pi*a*NA/lamda;      //computing normalized frequency
+
+printf("As normalized frequency is %.2f which is less than 2.405, this fiber will permit single mode transmission",v);
+
+lamda_cut_off=v*lamda/2.405
+lamda_cut_off=lamda_cut_off*10^9
+printf("\n\nSingle mode operation will occur above this cut off wavelength of %.2f nm",lamda_cut_off);
+printf("\n\n NOTE - Calculation error in the book.\n(1.447^2 - 1.442^2)^0.5=0.121; they have taken 0.141\nHence calculations after that are incorrect in the book");
+
+//Calculation error in the book.(1.447^2 - 1.442^2)^0.5=0.121; they have taken 0.141.Hence calculations after that are incorrect in the book.
+//They have taken radius as 2.6d-6, whereas in question it is given 3.6d-6.
+//answers in the book
+//Normalized frequency is 1.77.(incorrect)
+//cut off wavelength 956nm.(incorrect)