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The smallest particle visible to the naked eye is 40 microns. To give you some perspective, a piece of hair's width can range from 40 to 120 microns.
A new invention â the microsphere nanoscope â combines a standard microscope with a complex device (called a transparent microsphere) to allow you to see things up to 20 times smaller! Researchers believe this powerful new tool could allow them to see inside human cells and even examine live viruses in detail for the first time ever. In the future, scientists believe they'll be able to develop this tool to see even smaller things. Many researchers believe there is no theoretical limit on how small an object they'll one day be able to see.