//Chapter-2,Example2_2_3,pg 2-11

n2=2                                         //for second order minima 

n3=3                                         //for third order minima

wavelength_3=4000                             //wavelength of light for third order minima

//as second order minima is coincide with third order minima,  n2*wavelength2= n3*wavelength_3

wavelength_2=n3*wavelength_3/n2

printf("\nwavelength of light for second order minima is = %.f A.",wavelength_2)