re: Can you magnify something to infinite?

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Planck length.

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This is the theoretical limit of anything. After this point subatomic particles lose locality.

For anything it's 1/2 the size of the wavelength of the light you're looking with, so if you were looking with monochromatic violet light at 380 nm, the smallest object you could see would be 190 nm. To "see" things smaller than that you have to use EM radiation outside the small detectable limits of our eyes and have a computer interpret it for us to see anything.