The light from the person reflects off two different points on the mirror and enters your two eyes at slightly different angles, meaning your eyes see the person at a slightly different place (you can test this by closing one eye alternately). Your brain is smart enough to tell that this means the object is located a certain distance away from you, but not smart enough to realise that the light coming to it has not travelled a straight path, but has rather been bent by the mirror. Thus you see the reflected world with full depth, but reversed right and left.banerjeerupak said:but the reflection is what we see. it is coming from a two dimensional object. then how is it that we can see if someone is standing behind us. he should be see to be standing by my side. all the things that are to be seen should be seen in a single plane not in a 3D view. why does this not happen.
Good point. Along those lines, if you are standing 5 feet from a mirror and someone is standing 5 feet behind you, the fact that the light just bounces off the mirror means that the person doesn't just appear to be 15 feet away from you - the light actually traveled 15 feet to get to you and things like parallax are preserved.ZapperZ said:There is one thing being overlooked here....
When we view such light source, our two eyes and our optical nerve process these into various depth and perspective.
The same thing occurs when visible light is being reflected off an ordinary plane mirror. The phase difference between the different objects are preserved upon reflection. Thus, your eyes can't tell the different (other than the left-right switching) that you are looking at the image from a mirror rather than directly at it.
It has not only been tested, you can actually buy or simply build a device that uses 4 small mirrors that switch the left-eye view for the right and vice-versa. There was some university study somewhere that suggested than one should not do this for extended periods of time, as for some volunteers, the effect maintained for them for a short while even after the device was removed.banerjeerupak said:As Pallidin said, the foreground may become background, is this possible. has this been tested or is is just a hypothesis.