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+//Chapter-1,Example 1_3,Page 1-17
+clc()
+
+//Given Data:
+i=30*%pi/180         //angle of incidence
+u=1.46               //Refractive index of a oil
+lam=5.890*10^-7      //wavelength of required yellow light
+n=8                  //eighth dark band
+
+//Calculations:
+//u=sin i/sin r      //Snell's law   .So,
+r=asin(sin(i)/u)     //angle of reflection
+
+//Now, condition for dark fringe is
+//2ut*cos r=n*lam
+t=n*lam/(2*u*cos(r))      //thickness of film
+printf('Thickness of the film is =%.10f m',t)