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he discovered scanning electron microscope in 1942?​

Sagot :

Answer:

Max Knoll and Ernst Ruska

Explanation:

It was developed by Max Knoll and Ernst Ruska in Germany in 1931. The first Scanning Electron Microscope (SEM) debuted in 1942 with the first commercial instruments around 1965. Its late development was due to the electronics involved in "scanning" the beam of electrons across the sample.