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File: Microscopes Web Version
light microscopes were first developed in the 1500s one of the earliest inventors of microscopes was the dutch lens grinder anton van leeuwenhoek father of microscopy his microscopes were mostly ...

icon picture PPT Filetype Power Point PPT | Posted on 09 Sep 2022 | 3 years ago
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  • Light microscopes were first developed in the 
  1500s. 
  • One of the earliest inventors of 
  microscopes was the Dutch lens grinder 
  Anton van Leeuwenhoek. “Father of 
  Microscopy”
  • His microscopes were mostly single lens 
  magnifiers with a place to attach a specimen. 
  He is credited with producing over 250 
  different microscopes.
  • The first compound light microscope was 
   designed by the Jansens in 1590,  even 
   before van Leeuwenhoek.
  • The compound light microscope design 
   allowed biologists to view specimens 
   through a series of two lenses.  This gives 
   a greater  amount of magnification. The 
   total magnification possible is a product of 
   the two lenses used.
      Electron Microscopes:
     Light microscopes can only produce sharp 
   images of objects when the objects are larger 
   than 0.2 micrometers (2 ten thousandths of a 
   millimeter), or about 1/50th of the diameter of the 
   typical cell.
     Electron microscopes focuses a 
   beam of electrons on specimens, and 
   can form images 1000 times smaller 
   than those visible under the light 
   microscope.
   How can Electron microscopes see 
    much smaller objects than light?
  • Light wave lengths are too large for some very 
   tiny objects and do not reflect from them.
  • Electron beams have much                                  
          smaller wavelengths and can                        
                        reflect back from the smaller           
                        objects. (Images cannot be             
                               viewed directly as with light 
   microscopes.)
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...Light microscopes were first developed in the s one of earliest inventors was dutch lens grinder anton van leeuwenhoek father microscopy his mostly single magnifiers with a place to attach specimen he is credited producing over different compound microscope designed by jansens even before design allowed biologists view specimens through series two lenses this gives greater amount magnification total possible product used electron can only produce sharp images objects when are larger than micrometers ten thousandths millimeter or about th diameter typical cell focuses beam electrons on and form times smaller those visible under how see much wave lengths too large for some very tiny do not reflect from them beams have wavelengths back cannot be viewed directly as...

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