>> Isn't 116um less than the wavelength of visible light?
>
> I think you're confusing um and nm :-) My ruler here has 500 um
> divisions clearly marked, I estimate the width of the line used for the
> markings is about 100 um, it's clearly visible with the naked eye...
So is a 1nm object, if you have a sufficiently powerful microscope. :-P
So 100um might be visible from 40cm away then?
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