I need help on field of view for microscopes!?

Question

so there is a formula for the unknown diameter of field of view-

(magnification of "known" lense divided by maginification of "unknown" lense) times known diamter of f.o.v (field of view)

I know how to find the diamter of f.o.v by measuring it, and I know the "known" maginification (i set the scope to 40X), but what in the world is the "magnification of unknown lens"??

Answer 1

What if you have a drawer full of interchangeable lenses for your microscope. You take off the lens with known magnification from your microscope and you put an unmarked lens in its place. How can you find out the magnification of the unknown (unmarked) replacement lens? Use the formula.