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+//Chapter-2,Example2_4_1,pg 2-24
+
+wavelength_1=5000                                  //wavelength of light 
+
+wavelength_2=7000                                  //wavelength of light
+
+N=4000                                              //number of lines per cm
+
+m_1=1/((wavelength_1*10^-8)*N)                               //for wavelength= 5000 A.
+
+m_2=1/((wavelength_2*10^-8)*N)                                //for wavelength= 7000 A.
+
+printf('\nnumber of orders visible for 7000*10^-10 meter are  %.2f\n',m_2)
+
+printf('\nnumber of orders visible for 5000*10^-10 meter are  %.1f\n',m_1)