Zacharias Janssen was a Dutch spectacle-maker. He is mostly known for making the first microscope.
Robert Hooke's microscope had an oil lamp. It also had a lens that focused light from the flame onto the specimen.
Instead of buying a microscope, Leeuwenhoek made his own microscope. It looked nothing like the first microscope.
These three German scientists
2 German scientists by the names of Ernst Abbe and Carl Zeiss made the compound light microscope with lenses that improved the image by a lot. A mirror would focus the light up through the specimen.
A German physicist by the name of Ernst Ruska made the first electron microscope. This microscope can send electrons through a very thin specimen.
This microscope can send electrons over the surface of a specimen instead of going through it. Then, you see that the result is a three- dimensional image of the surface of the specimen.
This microscope can measure electrons that leak or 'tunnel' from the surface of a specimen.