 The wavelength of light for first order is = 1.20e-04 cm and it lies in the infrared region

 The wavelength of light for second order is = 6.0e-05 cm and it lies in the visible region

 The wavelength of light for third order is = 4.0e-05 cm and it lies in the visible region

 The wavelength of light for fourth order is = 3.0e-05 cm and it lies in the ultravoilet(invisible) region

The absent wavelengths in the reflected light are 6.0e-05 cm and 4.0e-05 cm