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+clear
+//
+//
+//
+
+//Variable declaration
+n2=1.3 //Cladding refractive index
+delta=0.14 //fractional index change
+
+//Calculation
+n1=n2/(1-delta) //Core refractive index
+
+//Result
+printf("\n Core refractive index is %0.2f ",n1)