A) M. Knoll and E Ruska
B) Robertson
C) Robert Hooke
D) Lehmann
Correct Answer: A
Solution :
Electron microscope was first developed in 1932 by M. Knoll and E. Ruska. It utilises a stream of high speed electrons which are deflected by an electrostatic or electromegnatic field in somewhat the same way that a beam of light is refracted when it crosses a glass lens. Robert Hooke developed the simple microscope when he studied the cell. Robertson (1959) forwarded the concept of unit membrane.
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