what two structures on the microscope are used to focus the specimen

The two structures on the microscope that are used to focus on the specimen are the coarse adjustment knob and the fine adjustment knob. The coarse adjustment knob is used to move the stage up and down to bring the specimen into focus, while the fine adjustment knob is used to make small adjustments to the focus to bring the specimen into sharp focus. Other structures on the microscope that are involved in focusing include the objective lenses, which are located in the nosepiece and magnify the specimen, and the condenser, which collects and focuses light from the illuminator onto the specimen.