Parts of a Microscope
Free printable parts of a microscope diagram — a labeled compound microscope showing the eyepiece, objective lenses, stage, focus knobs and more. Download a high-resolution PDF or PNG for Letter paper.
The parts of a microscope
A microscope is a tool that makes tiny objects look much bigger, so we can study things that are too small to see with our eyes alone. Here is what happens at each labeled part of the diagram:
| Part | What it does |
|---|---|
| Eyepiece | The lens at the top that you look through; it usually magnifies ten times. |
| Body tube | Connects the eyepiece to the objective lenses. |
| Arm | The curved part that supports the tube and is used to carry the microscope. |
| Nosepiece | The rotating piece that holds the objective lenses and lets you switch between them. |
| Objective lenses | The lenses close to the object that do most of the magnifying. |
| Stage | The flat platform where you place the slide you want to look at. |
| Diaphragm | Controls how much light passes up through the slide. |
| Light source | The lamp at the base that shines light up through the slide. |
| Coarse focus knob | The larger knob that moves the stage up and down quickly to focus. |
| Fine focus knob | The smaller knob that makes tiny adjustments for a sharp image. |
| Base | The bottom of the microscope that supports the whole tool. |
Companion worksheet
A free fill-in worksheet with an answer key, built from the labels above — students match each part to its description, then answer a couple of short questions. Great for a quick check after using the diagram.
How to print
Choose Download PDF for a ready-to-print file that fits US Letter paper (8.5 × 11") in landscape, or Download PNG for the high-resolution image.
Frequently asked questions
What are the main parts of a microscope?
The eyepiece, body tube, arm, nosepiece, objective lenses, stage, diaphragm, light source, coarse and fine focus knobs, and base.
What do the coarse and fine focus knobs do?
The coarse focus knob makes big, quick changes to focus, while the fine focus knob makes small adjustments to get a sharp, clear image.
What paper size should I print this on?
The diagram is sized for standard US Letter paper (8.5 × 11") in landscape orientation. Use "Download PDF" for a print-ready file that fits the page automatically.