2007-09-07 20:00:51 · 9 answers · asked by sarah w 2 in Science & Mathematics ➔ Biology
An atom. Because everything is made up of atoms?
2007-09-07 20:05:15 · answer #1 · answered by ßαßε 5 · 0⤊ 2⤋
Anything that subtends about 1 minute of arc (1/60 of a degree or about 1 inch at 100 yards) is pretty much invisible to most people if you're talking about seeing in reflected light.
But if it's something that actually emitts light, there is no theoretical lower limit since the eye responds to the total light energy and not the size of the aperture through which is radiates.
HTH
Doug
2007-09-08 03:12:26 · answer #2 · answered by doug_donaghue 7 · 1⤊ 0⤋
I read in biology class that the human ovum is just barely big enough to see.
2007-09-09 22:49:01 · answer #3 · answered by Anonymous · 0⤊ 0⤋
a spec of dirt or salt or pepper
2007-09-08 03:08:19 · answer #4 · answered by yaboysupadave 3 · 0⤊ 0⤋
your rods (not cones) are able to detect a single photon!
2007-09-08 05:37:06 · answer #5 · answered by Jose A 2 · 0⤊ 0⤋
An ant!
2007-09-08 03:16:36 · answer #6 · answered by discoveryman 2 · 0⤊ 0⤋
nice lil.
nice.
2007-09-09 00:19:27 · answer #7 · answered by Anonymous · 1⤊ 0⤋
my stepmom
2007-09-08 03:06:46 · answer #8 · answered by Anonymous · 0⤊ 0⤋
your penis
2007-09-08 03:06:46 · answer #9 · answered by Anonymous · 2⤊ 1⤋