Question

Who discovered the microscope which makes use of electrons for its working?
A. Robert Hooke
B. Ernst Ruska
C. Charles Darwin
D. Anton Von

Answer 1

Hint: Electron microscope was invented by Knoll and Ernst Ruska. For the invention of the electron microscope, Ernst Ruska was awarded the Nobel prize in 1986. Major advancements and developments in the field of cell biology emerged after the development of electron microscopes.

Complete answer: Electron microscopy: The microscope which makes use of electrons for its working is called the Electron microscope. The light source of an electron microscope is a beam of electrons.
Electron microscopy is based on electromagnetic theory. The resolution power and magnification of electron microscopes are much higher than that of conventional light microscopes.
Thus, electron microscopy was used for viewing the ultrastructure of both biological and non-biological specimens, such as microorganisms, intricate cell structure, organelles, tissues, macromolecular complexes, biopsy samples, metals, and crystals. Its discovery paved the way for a major breakthrough in cell biology.
It can be used for viewing both biological and non-biological specimens.

Types of Electron microscopy:
There are three types of electron microscope: Transmission electron microscope (TEM), Scanning electron microscope (SEM), and Reflection electron microscope (REM).
TEM and SEM
The most widely used electron microscope is TEM and SEM.
1. Transmission Electron microscope (TEM):
TEM was the first electron microscopy to be developed. It involves the original form of an electron microscope that used a beam of electrons at a thin slice of sample to create an image. It helps in understanding how components inside a cell, such as an organelle, are structured.
2. Scanning electron microscope (SEM):
SEM works by scanning the surface with a focused beam of electrons to create an image. Even at low magnifications, entire objects (such as insects) viewed on the SEM can be in focus at the same time. Areas ranging from approximately 1 cm to 5 microns in width can be imaged in a scanning mode using a conventional SEM technique.

So, the correct option is Ernst Ruska

Note: Robert Hooke, discovered cell. He is the Father of Cytology.
Charles Darwin developed and proposed the theory of evolution by natural selection and published his findings in Darwin's book "On the Origin of Species" in 1859.
Anton Van Leuwenhoek is the father of bacteriology.
He was the first to discover the living cell.