How are you going to focus small object as your spicemen using the compound microscope?

Focusing the Microscope:

This objective is the easiest to focus and center the image in the field of view. While looking at the objective lens and the stage from the side, turn the coarse focus knob so that the stage moves upward toward the objectives. Move it as far as it will go without touching the slide.

c

explanation:

trachea, alveoli, lung capillaries, arteries