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+//Chapter-1,Example 1_17,Page 1-43
+clc()
+
+//Given Data:
+Dn=0.225*10^-2       //Diameter of nth ring
+Dm=0.45*10^-2        //Diameter of (n+9)th ring
+lam=6*10^-7          //wavelength of light
+R=0.9                //Radius of curvature
+p=9
+
+//Calculations:
+//(Dn+p)^2-Dn^2=4*p*lam*R/u
+u=4*p*lam*R/((Dm)^2-Dn^2)    //Refractive index of liquid
+printf('Refractive index of liquid is =%.2f \n',u)