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+//Example 7_13
+clc();
+clear;
+//To calculate the refractive index of the core
+NA=0.39
+delta=0.05
+n1=NA/sqrt(2*delta)
+printf("The refractive index of the core is %.3f",n1)
diff --git a/3537/CH7/EX7.13/Ex7_13.txt b/3537/CH7/EX7.13/Ex7_13.txt
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+ The refractive index of the core is 1.233 \ No newline at end of file