1. Microscopes
Tools of Science

2. History of Microscope
The compound light microscope was invested by Hans and Zacharias Janssen
The first microscopes were novelty toys sold to the wealthy
The image quality was poor

3. Robert Hooke – 1660’s Chemist, mathematician, physicist, and inventor
Improved the CLM
Coined the term cells
We will talk more about him

4. Anton van Leeuwenhoek – 1670’s
Wine surveyor, cloth merchant, minor public officer
Used a single lens microscope
Made the best scopes available

5. b

6. Parts of the Microscope Explained
Ocular Lens
The lens you look into
Usually a power of 10x
Revolving nosepiece
Contains different objectives
Stage
Where slides are placed
Stage clips
Holds slides in place
Objective lens
One of 3 or 4 lenses on a microscope
They have different powers
Diaphragm
Adjusts amount of light illuminating specimen

7. To find Total Magnification
Multiple ocular x objective
If the ocular lens is 20x and the objective lens is 100x, what is the total magnification?
If total magnification is 300x and the ocular lens is 100x, what is the ocular lens?

8. Stereomicroscope Contains ________ ocular lenses
Total magnification is under 100x
Gives a 3-D image

9. Electron Microscopes Scanning Electron Microscope
Up to 300,000x
3-D image of specimen
_____________________ _____________________
Transmission Electron Microscope
Highest possible magnification
2-D image
____________________ ____________________

10. Scanning electron microscope
Sunflower pollen
Dust mite

11. Important Note: Your microscope lab is due Tuesday September 11, 2012!
Plan to stay after school on Monday September 10th to finish if needed… NO excuses!