How do you adjust the focus of the microscope when observing organisms at high magnifications?

The microscope is an instrument used for the visualization of the cell and its other component. Different types of microscope are compound microscope, electron microscope and binocular microscope.

The adjustment of the slide is important to visualize the focused object. A proper source of light is required to focus the image. At high magnification, the fine focus control is used for the adjustment. At 100 X the oil is used to visualize the object.

i think that d. wind is the answer.   i missed the question when i answered a. currents.