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+//Example 5.4, Page number 5.29
+
+
+clc;clear;close
+
+// variable declaration
+delta=0.05 //unitless
+n1=1.46//unitless
+
+// Calculation
+N_a=n1*(2*delta)**(1/2) // Numerical aperture
+
+// Result
+printf("Numerical aperture = %.2f",N_a)