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+//Chapter-2,Example 2_5,Page 2-31
+clc()
+
+//Given Data:
+m=1                   //order
+lam=6.56*10^-7        //Wavelength of red light
+theta=18.25*%pi/180   //angle of diffraction
+W=2*10^-2             //width of grating
+
+//Calculations:
+
+//We know, (a+b)*sin(theta)=m*lam
+N=sin(theta)/(m*lam)    //N-number of lines per m, N=1/(a+b)
+Tn=N*W                  //Total number of lines on grating
+printf('Total number of lines on grating is = %.0f ',Tn)