The size of common objects as 
viewed under microscopes. 
Diagrams of the parts of a 
light microscope (top) and 
an electron microscope 
(bottom). 
— Hen egg (shown half size) 
I i lunimingbird egg (shown half size) 
I Human egg (shown life size) 
Light source 
Condenser lens 
Object 
Objective lens 
<cte> 
Shown as if magnified 1 00 times 
Human egg superimposed on amoeba 
• Human liver cell 
• Influenza bacillus 
Intermediate 
image 
Projector lens 
(eyepiece) 
Observation screen or 
photographic plate 
Shown as if magnified 10,000 times 
• Pneumococcus bacterium 
• Hemoglobin molecule 
Electron source 
Magnetic 
condenser 
Object 
Magnetic 
objective 
Intermediate 
image 
Magnetic 
projector 
Observation screen or 
photographic plate 
12 
Second stage First stage Illumination 
