> So is a 1nm object, if you have a sufficiently powerful microscope. :-P

Har har - a "naked eye" doesn't usually have a microscope attached to it :-)

> So 100um might be visible from 40cm away then?

For me it is.

BTW I just checked and I'm sitting about 60 cm away from my monitor, which 
equates to 145 dpi if I assume 1/60 degree resolution of my eye.  My monitor 
is 95 dpi, so I guess it could be a bit higher resolution, or I need to sit 
further back :-)

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