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+//Chapter-1,Example 1_26,Page 1-48
+clc()
+
+//Given Data:
+i=45*%pi/180        //angle of incidence
+u=4/3               //Refractive index of soap film
+lam=5*10^-7         //wavelength of light
+t=1.5*10^-6         //thickness of film
+
+//Calculations:
+//u=sin i/sin r      //Snell's law   .So,
+r=asin(sin(i)/u)     //angle of reflection
+
+//Now, condition for dark band is
+//2ut*cos r=n*lam
+n=2*u*t*cos(r)/lam   //order of band
+printf('order of dark band is =%.1f \n',n)