//Chapter-2,Example2_6_4,pg 2-33

N=3*5000                                         //number of lines

n_l=5000*10^2                                    //number of lines per meter

wavelength=5890*10^-10                                  //wavelength of light 

m_max=1/(n_l*wavelength)

R_P_max=(m_max)*N

printf('\n The maximum R.P. = %.0f ',R_P_max)