Question

Electron microscope has a high resolution power. This is due to

• A. Electromagnetic lenses
• B. Very low wavelength of electron beam
• C. Low wavelength of light source used
• D. High numerical aperture of glass lenses used

Answer 1

Answer: (B)

Very low wavelength of electron beam

• An Electron microscope uses a beam of accelerated electrons as a source of illumination.
  
• The wavelength of electrons is thousands of times shorter than visible light, Hence electron microscopes would be able to resolve objects that are thousands of times smaller.
• Resolution is the ability to distinguish two objects from each other.
• The electron microscope has a high-resolution power. This is due to the very low wavelength of the electron beam. the electron microscopes have high resolving power. They can achieve a resolution of 0.2nm and magnifications up to 2,000,000 x.
• So, the correct answer is 'Very low wavelength of electron beam'.