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+// Example no. 2.1
+// To find a)The numerical aperture b)The acceptanca angle c)The relative index defference
+// Page no. 38
+
+clc;
+clear;
+
+// Given data
+n1=1.47;                                  // Refractive index of core
+n2=1.45;                                  // Refractive index of cladding
+
+// a)The numerical aperture
+NA=(n1^2-n2^2)^(1/2);                    // Numerical aperture
+
+// Displaying the result in command window
+printf('\n The numerical aperture = %0.4f',NA);
+
+// b)The acceptanca angle
+imax=asin(NA);                          // The acceptanca angle
+
+// Displaying the result in command window
+printf('\n The acceptanca angle = %0.4f Radian',imax);
+
+// c)The relative index defference
+delta=(n1-n2)/n1;                      // Relative index defference
+
+// Displaying the result in command window
+printf('\n The relative index defference = %0.4f',delta);