The focusing system adjusts the distance between the slide and the objective lens so that the image comes into focus.
The focusing system consists of two knobs - the coarse adjustment knob and the fine adjustment knob. When focusing, the operator first turns the coarse adjustment knob (which is the larger focus knob) in order to move the stage a large distance and bring the image into the focal plane of the objective lens. At this stage, the image will be visible but fuzzy. Then the operator turns the smaller knob, known as the fine focus knob, to fine tune the focus and to make the image sharply focussed.
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Answer:
The focusing system adjusts the distance between the slide and the objective lens so that the image comes into focus.
The focusing system consists of two knobs - the coarse adjustment knob and the fine adjustment knob. When focusing, the operator first turns the coarse adjustment knob (which is the larger focus knob) in order to move the stage a large distance and bring the image into the focal plane of the objective lens. At this stage, the image will be visible but fuzzy. Then the operator turns the smaller knob, known as the fine focus knob, to fine tune the focus and to make the image sharply focussed.