| A | B |
| eyepiece | where you look into the microscope |
| Nosepiece | objective lenses are mounted in this part of the microscope |
| diaphragm | disk under stage that controls amount of light that passes through the aperture |
| aperture | opening in stage that allows light through |
| coarse adjustment knob | begin focusing with this part of the microscope |
| fine adjustment knob | once object is in focus with the other knob, fine tune the image |
| arm | part that supports the entire upper portion of the microscope |
| base | support for microscope that holds it up |
| legs | mirror or lamp is located between these two things |
| stage | flat place under the objective lenses where you place the slide for viewing |