Mention different parts of spectrometer and explain the prelimainary adjustments, Spectrometer:

Explanation

Adjustment of the eyepiece : The telescope is turned towards an illuminated surface and the eyepiece is moved to and fro until the cross wires are clearly seen.
Adjustment of the telescope : The telescope is adjusted to receive parallel rays by turning it towards a distant object and adjusting the distance between the objective lens and the eyepiece to get a clear image on the cross wire.
Adjustment of the collimator : (i) The telescope is brought along the axial line with the collimator. The slit of the collimator is illuminated by a source of light. (ii) The distance between the slit and the lens of the collimator is adjusted until a clear image of the slit is seen at the cross wire of the telescope. (iii) Since the telescope is already adjusted for parallel rays, a well-defined image of the slit can be formed, only when the light rays emerging from the collimator are parallel.
Levelling the prism table : The prism table is adjusted or levelled to be in horizontal position by means of levelling screws and a spirit level.