Microscopes - PowerPoint PPT Presentation

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Microscopes

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Electron Microscope Used to observe VERY small objects: viruses, DNA, ... Can magnify up to 250,000x Types of Microscopes Scanning Electron Microscope ... – PowerPoint PPT presentation

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Title: Microscopes


1
Microscopes
  • Section 7.1

2
History of the Microscope
  • 1590 first compound microscope

3
History of the Microscope
  • 1655 Robert Hooke used a compound microscope to
    observe pores in cork
  • He called them cells

4
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5
History of the Microscope
  • Antoine van Leeuwenhoek
  • 1st to see single-celled organisms in pond water

6
Microscope Vocabulary
  • Magnification increase of an objects 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
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12
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13
Types of Microscopes
  • Scanning Electron Microscope (SEM)
  • Can magnify up to 100,000x

14
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15
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