The introduction of the electron microscope in the 1930's filled the bill. Co-invented by Germans, Max Knoll and Ernst Ruska in 1931, Ernst Ruska was awarded half of the Nobel Prize for Physics in 1986 for his invention.
Robert Hooke was the first to discover and invent the microscope in 1655.
Zacharias Janssen discovered the compound microscope
Light microscope were used to discover cells
The microscope used to discover bacteria was the light microscope, specifically the compound microscope. Anton van Leeuwenhoek, a Dutch scientist, first observed bacteria through a simple microscope he created in the late 1600s.
A light microscope is commonly used to discover cells due to its ability to visualize small structures like cells at a high resolution. Additionally, electron microscopes can also be utilized for more detailed imaging of cells at the nanoscale level.
the mechanical microscope
A simple version of a compound microscope was used to discover cells. Robert Hooke first described cells in 1665, using a compound microscope. Soon after, Anton van Leeuwenhoek also studied cells using a microscope with more advanced lenses.
cells
scientists are now able to discover bateria
Microscope
question for you what did the jansen brothers discover?
It should have been a light microscope considering the period of time he lived in.