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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.
The smallest objects that can be seen by the human eye are about 0.1 mm long. Some single-celled organisms are just big enough that you could see them. A human egg is about 0.12 mm in diameter. The vast majority of cells in your body and cells that form bacteria are too small to see without a microscope. Usually, when a cell gets too large, it divides or stops growing.