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Objectives 2 © Ryan Barrow 2008 09/08/22 06:38 PM Historical Timeline 1609 – Galileo Galilei develops a compound microscope with a convex and a concave les. 1665 – Robert Hooke publishes Micrographia and coins the word cell for structures he discovers in cork bark 1674 – Anton van Leeuwenhoek improves on a simple microscope for viewing biological specimens 1931 – Ernst Ruska starts to build the first electron microscope 3 © Ryan Barrow 2008 09/08/22 06:38 PM Types of Microscopes 4 © Ryan Barrow 2008 09/08/22 06:38 PM Types of Microscopes I Compound Microscope Light microscope that has two converging lens systems: the objective and the eyepiece 5 © Ryan Barrow 2008 09/08/22 06:38 PM Types of Microscopes II Electron Microscope Any class of microscopes that use electrons instead of light to form images of very small objects such as individual parts of small living things 6 © Ryan Barrow 2008 09/08/22 06:38 PM
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