1. The Microscope 6 th Grade

2. The History Many people experimented with making microscopes Was the microscope originally made by accident? (Most people were creating telescopes) The first microscope was 6 feet long!!! The Greeks & Romans used “lenses” to magnify objects over 1000 years ago.

3. The History Hans and Zacharias Janssen of Holland in the 1590’s created the “first” compound microscope Anthony van Leeuwenhoek and Robert Hooke made improvements by working on the lenses Anthony van Leeuwenhoek 1632-1723 Robert Hooke 1635-1703 Hooke Microscope

4. The History Zacharias Jansen 1588-1631 The “First” Microscope

5. How a Microscope Works Convex Lenses are curved glass used to make microscopes (and glasses etc.) Convex Lenses bend light and focus it in one spot.

6. How a Microscope Works Ocular Lens (Magnifies Image) Objective Lens (Gathers Light, Magnifies And Focuses Image Inside Body Tube) Body Tube (Image Focuses) Bending Light: The objective (bottom) convex lens magnifies and focuses (bends) the image inside the body tube and the ocular convex (top) lens of a microscope magnifies it (again).

7. The Parts of a Microscope

8. Body Tube Nose Piece Objective Lenses Stage Stage Clips Diaphragm Light Source Arm Stage Coarse AdjCoarse Adjustment Knob Fine AdjustmentFine Adjustment Knob Base Skip to Magnification Section Eye piece

9. Body Tube holds the objective lenses and the eye piece Diagram

10. Nose Piece holds the objective lenses Diagram

11. Objective Lenses increase magnification (4x to 40x) Diagram

12. Stage Clips Holds slide in place on stage. Diagram

13. Diaphragm controls the amount of light on the slide Turn to let more light in or to make dimmer. Diagram

14. Light Source Projects light upwards through the diaphragm, the slide and the lenses Diagram

15. Eyepiece Magnifies the specimen 10x Diagram

16. Arm supports the microscope when carried Diagram

17. Stage Supports the slide/specimen Diagram

18. Coarse Adjustment Knob Moves the stage up and down (quickly) for focusing your image Diagram

19. Fine Adjustment Knob This knob moves the stage SLIGHTLY to sharpen the image Diagram

20. Base Supports the microscope Diagram

21. Magnification

22. To determine your magnification…you just multiply the eye peice by the objective lens you are using Eye piece= 10x Objective 40x 10 x 40 = 400 Objective Lens have their magnification written on them. Eye piece usually magnifies by 10x So the object is 400 times “larger”

23. Caring for a Microscope Clean only with a soft cloth/tissue Make sure it’s on a flat surface Don’t bang it Carry it with 2 HANDS…one on the arm and the other on the base

24. Carry a Microscope Correctly

25. Using a Microscope Start on the lowest magnification Don’t use the coarse adjustment knob on high magnification…you’ll break the slide!!! Place slide on stage and lock clips Adjust light source (if it’s a mirror…don’t stand in front of it!) Use fine adjustment to focus

26. References http://www.cerebromente.org.br/n17/history/neurons1_i.htm Google Images http://science.howstuffworks.com/light-microscope1.htm

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