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Question

Electron microscope gives better image than ordinary microscope because
  1. It uses electron having higher wavelength.
  2. It uses electron having lower wavelength.
  3. It uses ultraviolet radiations.
  4. It uses polarized light.

A
It uses electron having higher wavelength.
B
It uses electron having lower wavelength.
C
It uses ultraviolet radiations.
D
It uses polarized light.
Solution
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Electron microscope is a large sized instrument which has an internal vacuum, high voltage (50,000 to 1,00,000 volts), a cooling system, a fast beam of electrons (0.54˚A wavelength), a cathode filament of tungsten, electromagnetic lenses (each having a coil of wire enclosed in soft iron casing) for focussing, magnification and projection and a fluorescent screen or photographic plate for observation. Wavelength of electron beam is 10,000 times shorter than wavelength of visible light. As a result, resolving power of electron microscope is very high. Resolving power of unaided human eye is 100 micrometer and 2 to 10˚A for electron microscope.

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