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+//Example 2.6 // minimum number of lines in grating
+clc;
+clear;
+//given data :
+w1=589D-9;//wavelength of one sodium line
+w2=5896D-10//wavelength of second line
+dw=w2-w1;//change of wavelength
+w=(w1+w2)/2;// mid wavelength
+n=1;//order of spectrum
+N=w/(n*dw);//number of lines in grating
+N=floor(N);//no. should be integer
+disp(N,"number of lines in grating")