Microscopes.ppt(1)
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The document discusses the history and types of microscopes. It notes that the first compound microscope was invented in 1590 and that Robert Hooke used one in 1655 to observe and name plant cells. Later, Antoine van Leeuwenhoek used a microscope to observe single-celled organisms. The document defines magnification and resolution as important factors for microscopes and describes the two main types - compound light microscopes, the most widely used, and electron microscopes, which use beams of electrons and can provide much higher magnification for very small objects like viruses.
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Microscopes.ppt(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”
- 5. History of the Microscope • Antoine van Leeuwenhoek –1st to see single-celled organisms in pond water
- 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
- 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
- 13. Types of Microscopes • Scanning Electron Microscope (SEM) –Can magnify up to 100,000x