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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.
Best Answer: Atoms are too much smaller than the wavelength of visible light to be seen, even under intense magnification, so we use indirect observations. High powered electrons have a small enough wavelength to resolve at atomic scales, so we can in theory use electron microscopes to resolve large atoms.toms are too small to be directly seen using the wavelengths of light that human eyes are capable of perceiving, so what your teacher said is true. However, expensive equipment such as scanning-tunneling electron microscopes and atomic force microscopes can detect individual atoms and display the output to a screen.