None can. They have to be seen using a electron microscope.
Viruses are too small to be seen in a light microscope.
AIDS is the disease caused by the virus called HIV. It can not be seen under a light microscope (as one in the class lab) but you must use an electron microscope as they are very tiny.
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A virus is much smaller than the resolution limit of a light microscope, which is about 200 nanometers. Viruses typically range from 20-400 nanometers in size, making them too small to be seen with a light microscope. Detection usually requires an electron microscope, which has much higher magnification capabilities.
Since a virus is far smaller than a typical cell (much smaller than a prokaryote) a virus cannot be seen by a regular microscope. To see a virus, you should get an electron microscope.
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The density of the nucleus can be seen using the light microscope, because the light microscope enlarges or makes the nucleus bigger.
Viruses can only be seen with electron microscopes
An electron microscope is typically used to see a flu virus. This type of microscope uses a beam of electrons to create a high-resolution image, allowing for the visualization of very small structures like viruses.
A virus is the smallest because you can see a freckle with naked eye and you can see a skin cell under ordinary light microcope but viruses are ultramicroscopic and cannot be seen under light microcope. Instead a virus can only be seen under high resolution electron microscope.
SARS is a virus, requiring an electron microscope to be seen.
Depends on the mechanism of the microscope, but with an optical microscope, anything smaller than 1/4 the wavelength of the light being used (around 10-6 Meters) eg a virus.