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+//Example 1.25 // diameter of bright ring
+clc;
+clear;
+//given data :
+w=6D-7;// wavelength used in m
+R1=3;//radius of curvature of convex lens in m
+R2=4;//radius of curvature of concave lens in m
+n=13;// order of ring
+r=sqrt((2*n-1)*w/(2*(1/R1-1/R2)));// radius of ring
+disp(2*r,"diameter of bright ring in m")
+
+