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+//Example number 12.6, Page number 265
+
+clc;clear;
+close;
+
+//Variable declaration
+n1=1.6;          //Core refractive index
+n0=1.33;         //refractive index of air
+n2=1.4;          //Cladding refractive index
+//Calculation
+NA=sqrt(n1**2-n2**2)/n0;    //numerical aperture
+theta0=asin(NA);    //acceptance angle(radian)
+theta0=theta0*180/%pi;    //acceptance angle(degrees)
+//Resul"
+printf("acceptance angle is %.2f degree",theta0)
+//answer in the book varies due to rounding off errors