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The Microscope

The Microscope. Microscope History . 14 th Century. The art of grinding lenses is developed in Italy and spectacles are made to improve eyesight . . 1590 . Dutch lens grinders Hans and Zacharias Janssen make the first compound microscope by placing several lenses in a tube. . 1667 .

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The Microscope

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  1. The Microscope

  2. Microscope History

  3. 14th Century • The art of grinding lenses is developed in Italy and spectacles are made to improve eyesight.

  4. 1590 • Dutch lens grinders Hans and Zacharias Janssen make the first compound microscope by placing several lenses in a tube.

  5. 1667 • Robert Hooke studies various objects with his microscope and publishes his results in Micrographia. He used a compound microscope to discover that living things were composed of cells.

  6. 1675 • Anton van Leeuwenhoek, Known as the Father of Microscopy, uses a single lens microscope (only one lens) to look at blood, insects, etc…He was first to describe cells and bacteria with detail • Microscopy: the study of very small things

  7. 18th Century • Creation of microscopes using two or more lenses. These are called compound microscopes.

  8. 1903 • Richard Zsigmondy develops the ultra microscope. • To study objects below wavelength of light

  9. 1932 • Frits Zernike invents the phase-contrast microscope. • Use to study colorless and transparent biological materials

  10. 1938 • Ernst Ruska develops the electron microscope. • Uses electrons to increase visibility

  11. 1981 • Gerd Binnig and Heinrich Rohrer invent the scanning tunneling microscope. • Creates 3-D images of objects down to atomic level

  12. Microscope Parts

  13. Microscope Magnification

  14. Magnification • Refers to the Power of a Microscope. • 4 levels of Magnification are: • Scanning: 4X • Low Power: 10X • High Power: 40X • Eyepiece Objective: 10X

  15. Total Magnification • Calculated by taking the eyepiece objective TIMES the objective lens Example: Looking through high power 10 X 40 = 400

  16. Power of Magnification Low Power-Youare able to See a large field of view, but not as much detail. High Power-the field of view is smaller, but you are able to see more detail.

  17. Microscope Terms to Know

  18. Field of View • Refers to the amount of a specimen we are able to see; decreases as the power of magnification increases.

  19. Slide • Rectangular glass plate used to view samples of water or other materials.

  20. Cover Slip • Small glass or plastic piece that is used to cover a water drop on a slide.

  21. CELLS ARE ARTWORK (thanks to microscopes)

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