just think...
2007-11-20 04:57:51 · 3 answers · asked by Raj 2 in Science & Mathematics ➔ Physics
The focal length of the eye is on the order of 50 cm or so. Therefore, anything more than ten meters away or so is, for all practical purposes, at an infinite distance. In other words, your eyes focus the same way on a distant tree as they would on the Andromeda galaxy, the most distant object visible to the unaided eye.
You could see further than Andromeda, if there were something further away that were bright enough to see. But most objects are simply too dim to see at such great distances.
2007-11-20 07:09:08 · answer #1 · answered by jgoulden 7 · 0⤊ 0⤋
You can. The Andromeda galaxy, for instance, is visible to the naked eye and is 2 million light-years away.
2007-11-20 05:04:02 · answer #2 · answered by ZikZak 6 · 1⤊ 0⤋
is there anything at infinity to look at? no
or that it would be too dim? (like 1/r^2 at infinity...)
is that what you were trying to get at?
2007-11-20 05:17:14 · answer #3 · answered by Anonymous · 0⤊ 0⤋