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+//Chapter-1,Example 1_11,Page 1-22
+clc()
+
+//Given Data:
+i=asin(4/5)          //angle of incidence
+u=4/3                //Refractive index of a soap film
+lam1=6.1*10^-7       //wavelength of light
+lam2=6*10^-7         //wavelength of light
+
+//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
+//for consecutive bands, n=lam2/(lam1-lam2). hence
+
+t=lam2*lam1/((lam1-lam2)*2*u*sqrt(1-(sin(i)/u)^2))     //thickness of film
+printf('Thickness of the film is =%.7f m',t)
+