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+
+//Chapter 2 : Diffraction
+
+clear;
+
+//Variable declaration
+lamda=5893*10**-8         //wavelength
+dlamda=6*10**-8
+n=3                       //third order
+
+//Calculations
+N=lamda/(n*dlamda)
+
+//Result
+mprintf("Number of grating lines= %.1f",N)
+