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+clc//
+//
+//
+
+//Variable declaration
+NA=0.39; //numerical aperture
+delta=0.05; //difference of indices
+
+//Calculation
+n1=NA/sqrt(2*delta); //refractive index of core
+
+//Result
+printf("\n refractive index of core is %0.4f ",n1)
+printf("\n answer varies due to rounding off errors")