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+//Chapter-1,Example 1_7,Page 1-19
+clc()
+
+//Given Data:
+i=30*%pi/180         //angle of incidence
+u=1.43               //Refractive index of a soap film
+lam=6*10^-7          //wavelength of light
+n=1                  //For minimum thickness
+
+//Calculations:
+//u=sin i/sin r      //Snell's law   .So,
+r=asin(sin(i)/u)     //angle of reflection
+
+//Now, condition of minima in transmitted system is
+//2ut*cos r=(2n-1)lam/2
+t=lam/(2*2*u*cos(r))      //minimum thickness of film
+printf('Minimum thickness of film is =%.9f m',t)