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+//Chapter-1,Example 1_15,Page 1-42
+clc()
+
+//Given Data:
+n=6              //6th bright ring
+D6=0.31*10^-2    //Diameter of 6th ring
+lam=6*10^-7      //wavelength of light
+R=1              //Radius of curvature
+
+//Calculations:
+
+//Diameter of nth bright ring is 
+//Dn^2=2(2n-1)*lam*R/u. Hence
+u=2*(2*n-1)*lam*R/(D6)^2    //Refractive index of liquid
+printf('Refractive index of liquid is =%.3f \n',u)