// Example 2.7.6 page 2.27 clc; clear; delta=1/100; //relative refractive index n1=1.3; //core refractive index lamda=1100d-9; //wavelength a=(2.4*lamda)/(2*3.14*n1*sqrt(2*delta)); //computing radius of core d=2*a; //computing diameter of core a=a*10^6; d=d*10^6; printf("\nCore radius is %.1f micrometer\nCore diameter is %.1f micrometer",a,d); printf("\nNOTE - In the book they have asked diameter of core. However, they have calculated only radius.");