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+//  chapter 12
+// example 12.1
+// calculate fractional index change for a given optical fibre
+// page 360
+clear;
+clc;
+// given
+u1=1.563; // refractive index of core
+u2=1.498; // refractive index of cladding
+//calculate
+d=(u1-u2)/u1; // calculation of fractional index change
+printf('\nThe fractional index change for a given optical fibre is %.4f',d);
+
+