When using a compound microscope, what is the difference between the coarse
focus and fine focus knobs?
1 - They are the same, and can be used interchangeably.
2 - The coarse focus should only be used at the lowest scanning power objective.
3 - The coarse focus changes the field of view, and fine focus changes the depth.
4 - The fine focus is used to make broad changes to observe different layers in the
specimen"