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+//Chapter-2,Example 2_26,Page 2-48
+clc()
+
+//Given Data:
+m=2                //order
+lam=6*10^-7        //Wavelength of light
+dlam=6*10^-10      //difference in wavelength
+W=2*10^-2          //Width of surface
+
+//Calculations:
+
+//We know that R.P.=lam/dlam=m*N
+N=lam/dlam/m      //Number of lines on grating
+GE=W/N            //Grating element=(a+b)
+printf('Grating element is = %.6f cm \n \n',GE)