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+//Example 2.14 //Radius of half period element
+clc;
+clear;
+//given data
+f=50;//focal length of convex lens in cm
+w=5D-5;// wavelength used in cm
+n=1;// order of principal maxima
+r=sqrt(n*f*w);// radius of half period element
+disp(r,"Radius of half period element in cm")