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+// Example 2.2.b:Numerical Aperture
+clc;
+clear;
+close;
+n1=1.50;//Waveguide Refractive Index
+n2=1.47;//Cladding Refractive Index
+NA=sqrt(n1^2-n2^2);// Numerical Aperture
+disp(NA,"Numerical Aperture is")