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+//Example 2.17 //radii of transparent zone
+clc;
+clear;
+//given data
+f=1;//focal length in m
+n=1;//order of zone
+w=5893D-10;// wavelength used in m
+r=sqrt(n*f*w);//radius of transparent zone
+disp(r,"radius of tranparent in m")
+n=3;//next order
+r=sqrt(n*f*w);//radius of transparent zone
+disp(r,"radius of tranparent in m")
+n=5;//next order
+r=sqrt(n*f*w);//radius of transparent zone
+disp(r,"radius of tranparent in m")