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+//Chapter-1,Example 1_20_2,Page 1-53
+clc()
+
+//Given Data:
+r=45*%pi/180         //angle of refraction
+u=1.45               //Refractive index of a medium
+lam=5.5*10^-7        //wavelength of required yellow light
+n=1
+
+//Calculations:
+
+//Now, condition for dark fringe is
+//2ut*cos r=n*lam
+t=n*lam/(2*u*cos(r))      //thickness of thin medium
+printf('Thickness of the thin medium is =%.10f m',t)