if i have a hat 50 meter away can i see exactly what is written on him?
2007-01-07 07:07:15 · 4 answers · asked by omri g 1 in Science & Mathematics ➔ Biology
There are two issues here: resolution of detail and distance vision. They are not the same.
A person with less than ordinary vision can ususally see the Andromeda Galaxy on a starless night; it is milllions of light years away.
The issue of resolution is what is measured by an eyechart with rows of letters. People with extraordinary vision may have 20/10 acuity, meaning they can see at 20 feet what a normal person can just make out at 10 feet. A hawk may have 20/2 or better acuity.
2007-01-07 07:13:46 · answer #1 · answered by Jerry P 6 · 0⤊ 1⤋
Forget about distance. You're talking about resolution. Read up on eye sight because your ideas are a bit skewed.
How far can a man see? Well I can see stars thousands of light years away - thats pretty amazing, right?
2007-01-07 15:13:39 · answer #2 · answered by Anonymous · 1⤊ 0⤋
would need to define effective. in your example it would depend on the individuals sight, atmospheric conditions and the size of the lettering
eg humans can see andromeda w the naked eye at night, tahts about 2million light years away i believe
2007-01-07 16:32:53 · answer #3 · answered by cav 5 · 0⤊ 0⤋
the human eye can see a single candlelight's flame from up to a mile away at night
2007-01-07 16:34:51 · answer #4 · answered by Kevin 2 · 0⤊ 0⤋