1. Chapter7
Microscopes and cells

2. Microscopes reveal cell structure
Robert Hooke , an English scientist, invented the microscope in the 1600’s to view cork
He named the “little boxes” he saw, “cells” – plant cell

3. Anton van Leeuwenhoek Used a microscope to view pond water
He named the single-celled organisms he discovered “animalcules”

4. Measuring the size of cell structures
Measurements are in metric units
Micrometers are one-millionth of a meter ( the size of a bacterial cell)

5. Characteristics of microscopes
Magnification vs. Resolution
makes an image -makes an image
appear larger than appear more or less
its actual size clear
BOTH are needed to view the details of extremely small objects clearly

6. Different types of microscopes
Light microscopes Electron Microscopes
Light passes through uses a beam of electrons
one or more lenses to form an image
to produce an enlarged
image

7. Compound Light Microscope
Used in high school labs
Most powerful magnifies 2,000x
Can view live specimens
Much less powerful than electron microscope

8. Electron Microscopes Can magnify up to 200,000x
No live specimens can be viewed

10. Rules when using the Microscope
Carry the microscope by the arm and base.
Place the microscope 4 – 6 inches from the edge of the lab table.
Do not use the coarse adjustment when on high power.

11. Field of View 3 things to include in a Microscope drawing: Title
At least 1 label
Total magnification