Microscope can help human to have a closer look into an object. Especially for the objects that are too small for the naked eyes. The conventional microscopes are the optical one. The principle is magnifying image by lens. But nowadays, when scientists have to investigate objects down to nanometer and picometer, they cannot use optical microscopes. The electron microscope is used instead to avoid the diffract of light.
The most advanced microscope, Scanning Transmission Electron Holography Microscope. It is 7-tonne, 4.5-metre tall. The STEHM is a one-of-a-kind machine built for UVic in Japan by Hitachi High Technologies Canada and is the highest-resolution microscope in the world. It will allow researchers to see things 20 million times smaller than the tiniest thing the unaided human eye can see.
the STEHM uses an electron beam and holography techniques to observe the inside of materials and their surfaces to an expected resolution smaller than the size of an atom. Standard high-resolution microscopes have about 20 lenses for imaging the specimen, the STEHM has 50. The microscope is so sensitive that its image could be affected by little more than a passing cloud. For this reason, it is housed in a special self-contained, extra-tall room that is anchored to bedrock and encased in eight inches of insulation sandwiched between layers of galvanized steel.
This microscope is undoubtedly wonderful for scientists, medical researchers can use it to have better understand subatomic structures relevant to medical diagnostics.