Which microscope uses accelerated electrons to illuminate very small objects?

Which microscope uses accelerated electrons to illuminate very small objects?

• A. Light Microscope
• B. Electron Microscope
• C. Stereo Microscope
• D. Confocal Microscope

Answer: (B)

Using accelerated electrons to illuminate very small objects hinges on the limits of light-based imaging. Light microscopes rely on visible light and lenses, which restrict resolution to about 200 nanometers, so finer details can’t be resolved. An electron microscope overcomes this by using electrons as the illuminating particles. When electrons are accelerated to high speeds, their wavelength becomes extremely short, greatly increasing resolving power and allowing visualization at the nanometer scale or smaller. This is why electron microscopes can image tiny structures that light microscopes cannot. There are two common forms: one that transmits electrons through a thin sample to reveal internal details, and another that scans a surface with electrons to show topology. The other instruments use light for illumination and are limited by the wavelength of light, so they can’t achieve the same level of detail for very small objects.

Using accelerated electrons to illuminate very small objects hinges on the limits of light-based imaging. Light microscopes rely on visible light and lenses, which restrict resolution to about 200 nanometers, so finer details can’t be resolved. An electron microscope overcomes this by using electrons as the illuminating particles. When electrons are accelerated to high speeds, their wavelength becomes extremely short, greatly increasing resolving power and allowing visualization at the nanometer scale or smaller. This is why electron microscopes can image tiny structures that light microscopes cannot. There are two common forms: one that transmits electrons through a thin sample to reveal internal details, and another that scans a surface with electrons to show topology. The other instruments use light for illumination and are limited by the wavelength of light, so they can’t achieve the same level of detail for very small objects.