1. MICROSCOPE
PARTS AND FUNCTIONS

2. Coarse adjustment knob
Ocular / Eyepiece
Barrel
Body tube
Coarse adjustment knob
Fine adjustment knob
Revolving Nosepiece
Arm
High Power Objective
Stage clips
Low Power Objective
Diaphragm
Stage
Mirror
Base

3. PART
FUNCTION
OCULAR/
EYEPIECE
It is where one views the enlarged object. (10x,15x)
BARREL
It is where the ocular/eyepiece is located and connects it to the body tube.
BODY TUBE
It connects the eyepiece and the revolving nosepiece.
ARM
Supports the lenses, body tube, and mirror. It is the part that should be held by one hand when carrying a microscope.

4. PART
FUNCTION
REVOLVING NOSEPIECE
Holds the objectives and protects it from dusts.
OBJECTIVES
Magnifies the specimen being observed. There can be two to four objectives in one microscope.
HIGH POWER OBJECTIVE (HPO)
Can magnify from 40x to 100x.
Usually the longest objective.
(blue or white stripe)
LOW POWER OBJECTIVE (LPO)
Can magnify 10x.
Shorter than HPO.
(yellow stripe)

5. PART
FUNCTION
OIL IMMERSION OBJECTIVE (OIO)
Can magnify 4x.
Usually the shortest objective.
Uses specialized oil.
(red stripe)
DIAPHRAGM
Regulates the passage of light through the stage.
STAGE
A platform that holds the slide that allows light to pass through the specimen.
MIRROR
Reflects light coming from the light source that passes through the specimen going to the eyepiece.

6. PART
FUNCTION
BASE
Supports the microscope. It is the part that should be held by the other hand when carrying a microscope.
STAGE CLIPS
Hold the slide in place on the stage.
COARSE ADJUSTMENT KNOB
Moves the body tube up and down. Used to view a specimen when using the LPO.
FINE ADJUSTMENT KNOB
Used to make small focus adjustment when using the HPO.

7. FOCUSING THE MICROSCOPE
First, find the light source by adjusting the mirror.
Align the objective with the hole on the stage and eyepiece. You should hear a ‘tick’ sound when it is aligned properly.
While peeking through the eyepiece, slowly turn the coarse adjustment knob to move the body tube downward.
If you have seen the specimen, urn the HPO to adjust the focus.