>> 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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