| Term | Definition |
| eyepiece | contains a lens that magnifies about 10X |
| body tube | separates the eyepiece lens from the objective lens |
| coarse adjustment knob | moves the body tube for focusing with the low-powered objective lens |
| fine adjustment knob | moves the body tube for focusing with the high-powered objective tube |
| arm | supports the body tube |
| stage | supports the slide being moved |
| stage clip | holds the slide in place |
| base | supports the microscope |
| noise piece | holds the low-powered and high-powered objective lenses; allows the lenses to rotate for viewing |
| low-powered objective lens | magnifies 10X |
| high-powered objective lens | magnifies by 40X |
| diaphragm | controls the amount of light passing through the opening of the stage |
| mirror | reflects light upward though the diaphragm |