Which is more powerful, the light microscope or the electron microscope?
With the rapid development of science and technology, the application prospects of electron microscopy in the field of microscopy are very broad, demonstrating its unique advantages over optical microscopy. However, due to the different technologies and fields of application between optical microscopes and electron microscopes, electron microscopes cannot completely replace optical microscopes.
In terms of biological applications, the resolution of optical microscopes is far inferior to that of electron microscopes, because the resolution of optical microscopes is limited by diffraction limits, so its resolution cannot be less than half of the wavelength of incident light. That is to say, if 400nm incident light is used, the observed object cannot be less than 200nm. However, due to its ability to perform real-time and dynamic observations, its position in biology is unparalleled. It is impossible to leave optical microscopes such as fluorescence microscopy and confocal microscopy in the field of biology. Due to the use of electron beams for scanning and imaging, electron microscopes can easily achieve nanometer resolution, which is irreplaceable for high-resolution imaging applications.
In terms of application in metallographic analysis, the magnification of electron microscopes far exceeds that of optical microscopes. The maximum magnification of modern electron microscopes has exceeded 3 million times, while the maximum magnification of optical microscopes is about 2000 times. Therefore, electron microscopes can directly observe the neatly arranged atomic lattice in the atoms and crystals of certain heavy metals.
