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// Example 2.12.1
clc;
clear;
a=4.5d-6; //core diameter
delta=0.25/100; //relative index difference
lamda=0.85d-6; //operating wavelength
n1=1.46; //core refractive index
v= 2*%pi*a*n1*sqrt(2*delta)/lamda; //computing normalized frequency
lamda_cut_off=v*lamda/2.405; //computing cut off wavelength
lamda_cut_off=lamda_cut_off*10^9;
printf("\nCut off wavelength is %.d nanometer.",lamda_cut_off);
printf("\n\nWhen delta is 1.25 percent-");
delta=1.25/100;
v= 2*%pi*a*n1*sqrt(2*delta)/lamda; //computing normalized frequency
lamda_cut_off=v*lamda/2.405; //computing cut off wavelength
lamda_cut_off=lamda_cut_off*10^7;
lamda_cut_off=round(lamda_cut_off);
lamda_cut_off=lamda_cut_off*100;
printf("\nCut off wavelength is %.d nanometer.",lamda_cut_off);
//answer in the book for cut off wavelength in the book is given as 1214nm, deviation of 1nm.
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