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+clear
+//
+//
+//
+
+//Variable declaration
+n1=1.5 //Core refractive index
+n2=1.3 //Cladding refractive index
+
+//Calculation
+delta=(n1-n2)/n1 //fractional index change
+
+//Result
+printf("\n fractional index change is %0.3f ",delta)