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TEM is a microscope that uses an electron beam. A transmission electron microscope is best for the study of structures smaller than cells.
TEM (Transmission Electron Microscope):
- It is a large microscope that uses an electron beam instead of light.
- It gives the highest resolution(0.2 nm) of available microscopes.
- It has the highest magnification power (1000000) of very tiny organelles.
Therefore, a transmission electron microscope is best for the study of structures smaller than cells.
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The right answer is a. structures smaller than cells.
In the transmission electron microscope, electrons are emitted by heating a tungsten filament (or crystal of lanthanum hexaboride). These electrons are then accelerated with a voltage of between 200 and 1000 kV (1000 kV for the most expensive). Once the vacuum is in the cell, the electron beam is passed through a sample about 3 mm in diameter and less than 20 nanometers thick. Then this beam is focused with the help of magnetic lenses towards the screen or the photographic plate.
The operation of M.E.T is analogous to that of an optical microscope.
In light microscopy, a beam of photons is sent through a sample. This beam is then focused through optical lenses to the image plane of the lens. An enlarged image of the sample is observed.
