It takes a much more powerful electron microscope—using beams of electrons instead of rays of light—to take us down to nano-dimensions. Let's take a closer look at electron microscopes and how they work!Photo: This Hitachi S-4700 field-emission, scanning electron microscope can magnify over...
How Does a Microscope Work? - OpticalTo be useful, a microscope must accomplish three things: it must magnify the object you are trying to view, resolve the details of the object, and make these details visible. Understanding these ideas is the first step to learning how a microscope works...
The Romans first used glass to magnify images in the 1st Century, but the first microscope with a lens in a tube wasn’t made until the 1590s. Microscopes have continued to improve over the years and we can now get a magnification of x1500 with a light microscope!! There are two main...
Using very precisely made glass lenses, it takes the minutely separated light rays coming from something tiny (like a fly's eye) and spreads them apart so they appear to be coming from a much bigger object. Parts of a microscope A compound microscope uses two or more lenses to produce a...
If you want to see a hologram, you don't have to look much farther than your wallet. There are holograms on most driver's licenses, ID cards and credit cards. If you're not old enough to drive or use credit, you can still find holograms around your home. They're part of...
Walk into almost any business office, and you'll probably find a photocopier ("copier") with a line of people waiting to use it. For most businesses, small or large, the copier has become standard equipment, much like having a desk to work at and a chair to sit in. What if you had...
electrons instead of light. These have much better resolution than optical microscopes, because the wavelength of electrons is about 100,000 times shorter than visible light. However, this type of microscope can't reveal living cells, because the preparation steps or high-energy electron beams kill...
ultra-sensitive rapid diagnostic tests are much needed to identify the invisible reservoirs. The role of innovative tools becomes crucial in the fight against malaria and the WHO identifies three strategic pillars (universal access to prevention, drugs and diagnosis, elimination and surveillance), of ...
If you want to see a hologram, you don't have to look much farther than your wallet. There are holograms on most driver's licenses, ID cards and credit cards. If you're not old enough to drive or use credit, you can still find holograms around your home. They're part of...
How do you measure the power of a lens?If you've ever looked through binoculars, a telescope, or a magnifying glass, you'll know that some lenses magnify (or reduce) the apparent size of an object much more than others. There's a simple measurement that tells you how powerful a lens...