It is the first knob you should turn to bring the object into rough focus, before tinkering with the finer tuning knobs.
it is the course focus
meri potti
This is the coarse adjustment knob. This should be used before the fine adjustment knob (the smaller knob) - which is for fine focusing.
it is the COURSE adjustment knob
The coarse-adjustment knob moves the body tube up and down to allow focusing of the image.
It is the smallest knob on the microscope.
fine adjustment knob
Coarse adjustment knob.
On a light microscope there is the coarse adjustment knob and the fine adjustment knob
Focusing, its called a focusing knob.
The function of the coarse adjustment knob on a microscope is to lower or raise the stage of the microscope. This mechanism is used to focus the specimen.
The course adjustment knob raises and lowers the stage of the microscope. This knob is mainly used on the scanning and low power knob to simply find the specimen. When trying to focus directly, use the fine adjustment knob.
Nosepiece
It is the less precise focusing knob on a microscope.
The coarse adjustment knob is a component of a microscope. It is used to lower or raise the stage of the microscope in order to focus the specimen.
focus
Condenser focus