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+//Chapter-2,Example2_4_6,pg 2-26
+
+m=3                                     //third order 
+
+angle=90                                //for normal incidence 
+
+N=7000                                  //Number of lines per meter 
+
+wavelength=(sind(angle)/(m*N))*10^8
+
+printf('\nThe longest wavelength is lam = %.0f A. ',wavelength)