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+//Chapter-1,Example 1_1,Page 1-16
+clc()
+
+//Given Data:
+i=45*%pi/180         //angle of incidence
+u=1.33               //Refractive index of a soap film
+lam=5.896*10^-7      //wavelength of required yellow light
+
+//Calculations:
+//u=sin i/sin r      //Snell's law   .So,
+r=asin(sin(i)/u)     //angle of reflection
+
+//Now, condition for bright fringe is
+//2ut*cos r=(2n-1)lam/2
+//Here n=1
+t=lam/(2*2*u*cos(r))      //minimum thickness of film at which light will appear bright yellow
+printf('Minimum thickness of film at which light will appear bright yellow of required wavelength is =%.10f m',t)