My AmScope 149C (150 series) biologic light microscope is slighty different from you model, of course. The illustrated objective lenses on your model are similar. The numbers are not explained on my manual or detailed by your explanation. Thus the low power objective states it is 4/0.10; 160/0.17. Specifically, what do these numbers (and their units) mean? Thank you very much (for your RU-vid and the Microscope Club posts).