This is a visual representation of relativity. The light from the boy hits the camera lens faster than the light from the mirror as
1. The mirror is further away and
2. The light has to travel that small distance between the boy and the mirror 2 times once to hit the mirror and once again to travel to the camera.
' '
This effect can also been seen when taking a picture where both a mirror and the person in the reflection are both in frame during movement at the right angles.
I don't think you realise how fast the light travels. It travels at 300.000km/s, meaning that if the distance difference (so the extra length he light has to travel) was of 10 meters (which is a lot more than in this case) then it would take an extra 10/300000s, or 33microseconds.
Pictures where the person and the reflection are in the frame and in different positions are most likely due to shutter speed.
You're underestimating the different even such a small amount of time makes. The reason such a small time makes no difference when observing something in person is that you've only got that tiny space of time to notice the difference. In a picture or a video you have literally as much as required to notice even the tiniest of differences which the camera is extremely more capable of picking up than the human eye.
And I feel like you REALLY dont appreciate hoz short 33microseconds is. If the camera is capturing at 144fps (pulled that one out of my ass; no idea howmuch a phone camera actually takes; but I doubt its more than that) then it takes a picture every 7milliseconds, which is 7000 microseconds.
This is NOT due to light travel I can guarantee it. Most likely @sublimegamer is right.
1. The mirror is further away and
2. The light has to travel that small distance between the boy and the mirror 2 times once to hit the mirror and once again to travel to the camera.
' '
This effect can also been seen when taking a picture where both a mirror and the person in the reflection are both in frame during movement at the right angles.
Pictures where the person and the reflection are in the frame and in different positions are most likely due to shutter speed.
This is NOT due to light travel I can guarantee it. Most likely @sublimegamer is right.