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+//Chapter-1,Example 1_18,Page 1-44
+clc()
+
+//Given Data:
+D10=0.5*10^-2        //Diameter of 10th ring
+lam=5.5*10^-7        //wavelength of light
+u=1.25               //Refractive index of liquid
+
+
+//Calculations:
+//As Dn^2=4*n*R*lam/u
+//Dn^2 is inversely proportional to refractive index.
+D10n=D10/sqrt(u)          //new diameter of 10th ring after changing medium between lens and plate
+printf('new diameter of 10th ring after changing medium between lens and plate is =%.6f m \n',D10n)