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+//Chapter-1,Example 1_5,Page 1-18
+clc()
+
+//Given Data:
+t=0.2/(100)^2*10^-2   //thickness of film in meter
+lam=5.5*10^-7         //wavelength of light in meter
+r=0                   //normal incidence
+n=1                   //first band
+
+//Calculations:
+
+//Condition for dark fringe is
+//2ut*cos r =n*lam
+u=n*lam/(2*t*cos(r))   //Refractive index of a oil
+printf('Refractive index of a oil is =%.3f ',u)