Originally posted by uzless
what does the distance travelled by the light from the object have anything to do with it?
The problem for the person that needs glasses is that their eyes cannot focus on things far away properly. It has nothing to do with light particles.
this makes me think that you don't understand how vision actually works... which is i think what wumpus was trying to get at through his analogy with the scanner. it is similar to the analogy that was brought up about "looking through a pane of glass"
essentially the reason the object is blurry from far away is because the lens on your eye cannot properly receive and interpret the ambient light that is reflected off the object. placing a mirror in the middle of the light's path does not change the total distance it travels, and thus the perceived "distance" at which your brain attempts to construct the image. thus it appears blurry in the mirror, just as it would appear blurry if you stood at a distance of [distance from mirror to face] + [distance from mirror to object]
and looked directly at the object.
as wumpus accurately assessed, the fallacy in your logic is an assumption that the reflection in the mirror is some actual physical object on the surface of the glass, whereas in truth, it is more like a "bumper" (like in a game of billiards) where the light that your eyes will use to see the object bounces off is taken in by your eye.
if you do not think vision has anything to do with the movement of light particles, consider these questions: can you see an object when there is no light? why can't you "see" an object if there is no direct (or reflected) pathway between your eyes and the object? why does a pencil "look" bent if you put it at an angle in a glass of water?