EXPERIMENTAL PROCEDURES:
Spectrometer Setup
1. Remove prism from the turntable.
2. Position the instrument so that the telescope can be pointed at some distant object
3. Adjust the eyepiece of the telescope until the crosswires are in focus.
4. Focus the telescope on the distant object (infinity).
5. Position the instrument on the laboratory table.
6. Position a sodium lamp close to the slit at the end of the collimator.
7. Rotate the telescope so that it faces the collimator and you can observe the slit
image.
8. Adjust the collimator only until the image of the wide slit is in focus (it allows to
place a slit in the focal point of collimator lens and generate parallel rays coming out
from collimator).
9. Adjust the slit width until its image is just wider than the crosswires (i.e. make a slit
as narrow as possible to make measurements more precise).
Turntable Setup
The rotation axis of the turntable should be perpendicular to the plane containing the
principal axes of the telescope and collimator.
1. Place a prism on the centre of the turntable.
2. Adjust the height of the turntable using screws S1, S2, S3 (Figure 6) until the
collimator is centered on the vertical dimension of the prism.