Which one is better, optical microscope or electron microscope?
With the rapid development of science and technology, the application prospects of electron microscopes in the field of microscopy are very broad, showing its unique advantages over optical microscopes. However, because the application technologies and fields of optical microscopes and electron microscopes are different, electron microscopes cannot completely replace optical microscopes.
For applications in biology, the resolving power of an optical microscope is far inferior to that of an electron microscope. Because the resolution of an optical microscope is limited by the diffraction limit, its resolution cannot be less than half the wavelength of the incident light. In other words, if 400nm incident light is used, the observation object cannot be smaller than 200nm. However, because it can carry out real-time and dynamic observation, its status in biology is unparalleled. It is impossible to leave optical microscopes such as fluorescence microscopes and confocal microscopes in the field of biology. Since electron microscopes use electron beams to scan and image, their resolution can easily reach the nanometer level, which is irreplaceable for high-resolution imaging applications.
In terms of applications in metallographic analysis, the magnification of electron microscopes is also far greater than 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, so the electron microscope Microscopes can directly observe the atoms of certain heavy metals and the neatly arranged atomic lattice in the crystal.
