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.
Washington Teasdale
air cannot be seen because it is colourless
The future cannot be seen but is always in front of you.
No, you cannot be seen on CP.
It depend on what you think. I think emotions and light can be seen and not be seen.
sible
Atom
Although electricity is everything, it cannot be seen!
Atom
Antony van Leeuwenhoek. I loved his invention of the word 'animalcules', which unfortunately didn't catch on.
The answer to this riddle is "silence." While silence cannot be seen, it can definitely be heard or felt through the absence of sound.
Ultraviolet light cannot be seen by the human eye as it has a shorter wavelength than visible light.