Parts Of The Microscope

Note: Remember you are responsible for graphs, charts and other items that form part of the overall summary of this topic.

1. Ocular Lens (Eyepiece) - where you look through to see the image of your specimen.  Magnifies the specimen 10X actual size.

2. Body tube - the long tube that supports the eyepiece and connects it to the objectives.

3. Nosepiece - the rotating part of the microscope at the bottom of the body tube; it holds the objectives.


4. Objective Lenses - (low, medium, high).  Depending on the microscope, you  may have 2, 3 or more objectives attached to the

    nosepiece; they vary in length (the shortest is the lowest power or magnification; the longest is the highest power or


5. Arm - part of the microscope that you carry the microscope with; connects the head and base of the microscope.


6. Coarse Adjustment Knob - large, round knob on the side of the microscope used for "rough" focusing of the specimen; it may

    move either the stage or the upper part of the microscope.  Location may vary depending on microscope - it may be on the

    bottom of the arm or on the top.


7. Fine Adjustment Knob - small, round knob on the side of the microscope used to fine-tune the focus of your specimen after

    using the coarse adjustment knob.  As with the Coarse Adjustment Knob, location may vary depending on the microscope.

8. Stage - large, flat area under the objectives; it has a hole in it (see aperture) that allows light through; the specimen/slide is

    placed on the stage for viewing.


9. Stage Clips - clips on top of the stage which hold the slide in place.


10. Aperture - the hole in the stage that concentrates light through the specimen for better viewing.


11. Diaphragm - controls the amount of light going through the aperture; may be adjusted.


12. Light or Mirror - source of light usually found near the base of the microscope; used to direct light upward through the

      microscope.  The light source makes the specimen easier to see.

Parts Of The Microscope  >