information needed about microscopes

1. Microscopes

2. Microscope
•Device used to magnify biological
specimen

3. Types of microscopes
Compound
• Use light to show image
• Have 2 lenses
(objective lenses and
eye piece)
Electron
• Resolution is much
better
• Magnification is much
better
• Uses beams of
electrons to view image

4. Magnification
•The magnifying power of the eyepiece
leans x objective lenses
•E.g. 5x10=50

5. • Lenses ~ magnification
• Stage ~ to place the slide on
• Clips ~ hold the slide in place
• Condenser ~ to focus the light on the slide
• Diaphragm ~ to control the amount of light
• Coarse focus knob ~ to roughly focus the image
• Fine focus knob ~ to precisely focus the image
• Light/ mirror ~ to supply light to the object

6. Types of electron
microscope
•1. transmission electron microscope (TEM)
Shows the internal structure of specimen in
great detail
•2. scanning electron microscope (SEM)
Provides a surface view of specimen