In addition to seeing the transition to a smaller wavelength spread in the laser, the spectrometer also allows the observation
of tuning of the laser wavelength. The exact laser wavelength is dependent on which wavelength is being fed back
into the laser diode.By changing the angle of the reflecting mirror, a different frequency of light is sent back into the
diode, and the wavelength of the laser can be tuned. The change in wavelength is easily observable through its spatial
displacement at the image plane of the spectrometer.