How to centre the light of Spectrophotometer ?

How to centre the light of Spectrophotometer ?

After turning on the machine, firstly unplug the wire of the tungsten lamp.After unplugging it, you can see that the light is not centered within the slit. The light must hit the center of the slit. If not,then the reflector mirror must be adjusted.

There are two screws that you should loosen firstly as video shows.

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