1. Learning Objectives
Identify various microscope parts and state the function for each part.
Demonstrate the proper way to carry a microscope.

2. Microscope Notes

3. Robert Hooke (1665)
Described the cellular structure of cork. First to describe the structures as “cells”

4. Anton van Leeuwenhoek (late 1600s)
Improved lenses, discovered “animacules” and bacteria

5. Matthias Schleiden (1838)
Discovered that plant parts are made of cells

6. Theodor Schwann (1839)
Discovered that animal parts are made of cells

7. Rudolph Virchow (1855)
All cells arise from pre-existing cells

8. Important Cell Scientists
Acheivement
Hooke (1665)
Cellular nature of cork
Van Leewenhoek (late 1600s)
Lenses, bacteria
Schleiden (1838)
Plant cells
Schwann (1839)
Animal cells
Virchow (1858)
All cells arise from preexisting cells

9. Microscope
An instrument with one or more lenses that makes an enlarged image of an object.

10. Microscope Parts Ocular Lens (10X) Body Tube Arm Stage Stage Clips
Revolving
Nosepiece
Arm
Objective Lenses
(4X, 10X, 40X)
Stage
Stage Clips
Coarse Adjustment
Knob
Diaphragm
Fine Adjustment
Knob
Light Source
Base

11. Demo How to Carry a Microscope

12. YouTube Video How to Focus a Microscope

13. Steps for Focusing the Microscope
Place slide under the stage clips on stage
Turn to lowest (4X) objective lens
Turn on light
First, focus with coarse adjustment
Second, focus with fine adjustment
Change to middle (10X) objective lens
Repeat step 5 only
Change to high (40X) objective lens
Focus with fine adjustment

14. Calculating Total Magnification
Ocular Lens Magnification X Objective Lens Magnification

15. Cell Theory All living things are made up of cells
Cells are the basic units of structure and function
All cell arise from preexisting cells

16. Stop Here