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Microscopes

Microscopes. Section 2.2. History and use of the microscope. http://www.youtube.com/watch?v=ZYNThPzh03c. History of the Microscope. Antoine van Leeuwenhoek 1 st to see single-celled organisms in pond water. History of the Microscope.

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Microscopes

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  1. Microscopes Section 2.2

  2. History and use of the microscope http://www.youtube.com/watch?v=ZYNThPzh03c

  3. History of the Microscope • Antoine van Leeuwenhoek • 1st to see single-celled organisms in pond water

  4. History of the Microscope • 1655 – Robert Hooke used a compound microscope to observe pores in cork • He called them “cells”

  5. History of the Microscope • 1590 –first compound microscope

  6. Microscope Vocabulary • Magnification: increase of an object’s apparent size • Resolution: power to show details clearly • Both are needed to see a clear image

  7. Types of Microscopes • 1. Compound Light Microscope • 1st type of microscope, most widely used • light passes through 2 lenses • Can magnify up to 2000x

  8. Ocular lens Objective lenses

  9. Types of Microscopes • 2. Electron Microscope • Used to observe VERY small objects: viruses, DNA, parts of cells • Uses beams of electrons rather than light • Much more powerful

  10. Types of Microscopes • Transmission Electron Microscope (TEM) • Can magnify up to 250,000x

  11. Types of Microscopes • Scanning Electron Microscope (SEM) • Can magnify up to 100,000x

  12. Parts of a Microscope http://www.youtube.com/watch?v=KzNsuiqW1LQ

  13. How to use a microscope • http://www.youtube.com/watch?v=X-w98KA8UqU

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