Electron microscopes shoot a high-voltage beam of electrons onto or through an object, which deflects and absorbs some of the electrons. To see anything smaller than 500 nm, you will need an electron microscope. The most powerful light microscopes can resolve bacteria but not viruses. The power of a light microscope is limited by the wavelength of visible light, which is about 500 nm. Light microscopes use a system of lenses to magnify an image. It's even possible to make out structures within the cell, such as the nucleus, mitochondria and chloroplasts. Smaller cells are easily visible under a light microscope. A magnifying glass can help you to see them more clearly, but they will still look tiny. That means that under the right conditions, you might be able to see an amoeba proteus, a human egg, and a paramecium without using magnification. The smallest objects that the unaided human eye can see are about 0.1 mm long. Some cells are visible to the unaided eye
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