Bacteria can be directly seen from optical microscope or not?

Bacteria are single celled organisms with a diameter of about 0.5-2μm, and the maximum resolution of optical microscopes is about 200nm, so bacteria cannot be directly observed. Using an optical microscope can only observe the characteristics such as color and movement of bacteria, but cannot directly observe the bacteria themselves. If you want to observe bacteria, you can use an electron microscope, which has a higher resolution than an optical microscope and can directly observe the morphology and structure of bacteria.