From You Tube:
Humans have long known that glass bends light. However, it took us awhile to figure out that stacking lenses in a tube would open up a whole new world to science, finally allowing us a peek at the microscopic.
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Sources:
http://www.nobelprize.org/educational...
http://micro.magnet.fsu.edu/primer/mu...
http://www.visioneng.com/resources/hi...
http://campus.udayton.edu/~hume/Micro...
http://www.howeverythingworks.org/sup...
