Introduction To Microscopes History & Parts


Published on

Introduction to Microscopes (History, Function & Parts) PowerPoint

Published in: Technology, Education
1 Comment
  • yeah i like it
    Are you sure you want to  Yes  No
    Your message goes here
No Downloads
Total views
On SlideShare
From Embeds
Number of Embeds
Embeds 0
No embeds

No notes for slide

Introduction To Microscopes History & Parts

  1. 1. Introduction to Microscopes! Now Seeing IS Believing!
  2. 2. A Brief History
  3. 3. Simple Glass Magnifiers <ul><li>More than 500 years ago. </li></ul><ul><li>In 1600s, this “simple microscope” allowed scientists to see cells and bacteria </li></ul><ul><li>Problem: not enough magnification </li></ul>
  4. 4. First Compound Microscope <ul><li>Developed at the beginning of the 1600's, by the Janssen brothers and Galileo </li></ul><ul><li>Problem: images were blurred and had colored halos </li></ul>
  5. 5. Simple Compound Microscope <ul><li>Invented in 1660s </li></ul><ul><li>Problem: all images had red or blue “halos” around them </li></ul>
  6. 6. Even better! <ul><li>1700 and 1800s – great improvement in microscopes </li></ul><ul><li>Usually made of brass (expensive) </li></ul><ul><li>Had a tripod for support </li></ul>
  7. 7. Modern Compound Microscope <ul><li>1900s, started using iron instead of brass (cheaper) </li></ul><ul><li>Only one eyepiece (monocular) </li></ul><ul><li>Outside light source reflected onto mirror </li></ul><ul><li>Very functional </li></ul><ul><li>Still used today </li></ul>
  8. 8. Fancy! <ul><li>Better images </li></ul><ul><li>More magnification </li></ul><ul><li>Better lighting </li></ul><ul><li>Easier to use </li></ul><ul><li>Now everyone, at one time or another, has looked through a microscope </li></ul>
  9. 9. How Does It Work? <ul><li>A microscope works very much like a telescope. </li></ul><ul><li>A telescope must gather light from a dim, far away object. </li></ul><ul><li>So, it needs a large objective lens to gather as much light as possible and a long body to bring the image into focus. </li></ul>
  10. 10. How Does It Work? <ul><li>Unlike a telescope, a microscope must gather light from a tiny specimen that is close-by . </li></ul><ul><li>So the microscope does not need a large objective lens. </li></ul><ul><li>Instead, the objective lens of a microscope is small . </li></ul><ul><li>Then the image is again magnified by a second lens, called an eyepiece , as it is brought to your eye. </li></ul>
  11. 11. Parts of a Compound Microscope So EASY a KID could use it!
  12. 12. Base <ul><li>The bottom of the microscope, used for support </li></ul><ul><li>Hold this part with one hand when carrying a microscope </li></ul>←
  13. 13. Mirror <ul><li>Reflects the light so the specimen is easier to see </li></ul>←
  14. 14. Stage <ul><li>The flat platform where you place your slides.  </li></ul><ul><li>It has a hole in it so light can shine through </li></ul>←
  15. 15. Clip <ul><li>Shiny clips on the top of the stage </li></ul><ul><li>Holds a slide in place </li></ul>←
  16. 16. Arm <ul><li>Supports the tube and connects it to the base </li></ul><ul><li>The part you hold when you carry the microscope </li></ul>←
  17. 17. Coarse Adjustment <ul><li>Large, round knob on the side of the microscope </li></ul><ul><li>Either moves the stage or the top part of the microscope up and down </li></ul>->
  18. 18. Fine Adjustment <ul><li>Small, round knob on the side of the microscope </li></ul><ul><li>Used to fine tune the focus after using the coarse adjustment knob. </li></ul>->
  19. 19. Eyepiece <ul><li>The lens at the top that you look through. </li></ul><ul><li>10X power </li></ul>->
  20. 20. Body Tube <ul><li>The long tube that holds the eyepiece and connects the objective </li></ul>->
  21. 21. Nosepiece <ul><li>Rotating part of the microscope at the bottom of the body tube. </li></ul><ul><li>It holds the objective lenses </li></ul>←
  22. 22. High Power Objective <ul><li>The longest objective lens </li></ul><ul><li>The highest magnification </li></ul><ul><li>40X lens (40X x 10X = 400X magnification) </li></ul>->
  23. 23. Low Power Objective <ul><li>The shortest objective lens </li></ul><ul><li>The lowest magnification </li></ul><ul><li>4X lens (4X x 10X = 40X magnification) </li></ul>←
  24. 24. Mid Power Objective <ul><li>The medium length objective lens </li></ul><ul><li>The medium magnification </li></ul><ul><li>10X lens (10X x 10X = 100X magnification) </li></ul>←
  25. 25. Diaphragm <ul><li>Controls the amount of light going through the hole in the stage </li></ul>->
  26. 26. Pop Quiz <ul><li>What two parts should you hold when you carry a microscope? </li></ul><ul><ul><li>Base & Arm </li></ul></ul><ul><li>Where do you put a slide? </li></ul><ul><ul><li>On the Stage </li></ul></ul><ul><li>To focus, what knob do you turn first? Second? </li></ul><ul><ul><li>First, Coarse Adjustment </li></ul></ul><ul><ul><li>Second, Fine Adjustment </li></ul></ul>← ← -> ← ←
  27. 27. Test Your Skills . . . <ul><li>Arm </li></ul><ul><li>Body Tube </li></ul><ul><li>Stage </li></ul><ul><li>Clip </li></ul><ul><li>Base </li></ul><ul><li>Coarse Adjustment </li></ul><ul><li>Fine Adjustment </li></ul>
  28. 28. Test Your Skills <ul><li>High Power Objective </li></ul><ul><li>Low Power Objective </li></ul><ul><li>Mirror </li></ul><ul><li>Eyepiece </li></ul><ul><li>Nosepiece </li></ul><ul><li>Diaphragm </li></ul>