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  Zaccharias Janssen and Hans Janssen discovered to first compound microscope. Compound Microscope allows lights to pass through the specimen and use two lenses to form an image.
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  Dutch merchant Anton van Leeuwenhoek used a microscope with one lens and it canobtained a magnification of
nearly 300 times. He is called "Father of Microscopy" and he created more than 240 microscopes. - 
  
  Robert Hooke used a crude microscope and discovered cells by using this microscope. And he is the first people describe the smallest unit of life as cells.