Why Do Mirrors Reverse Left and Right?
Stand in front of a mirror and raise your right hand.
The person in the mirror appears to raise the left hand.
So we naturally say, “The mirror reverses left and right.”
But surprisingly, it doesn't!
A mirror reverses front and back, not left and right.
If you stand one metre in front of a mirror, your reflection appears one metre behind it. Your front becomes the apparent back-to-front direction.
Why then does your right hand seem to become the left?
Imagine turning yourself around to face your reflection. To make your right side match the reflection's position, you would have to rotate yourself around a vertical axis. That rotation makes the right and left sides appear exchanged.
The mirror itself has not swapped them.
A simple experiment makes this clearer: write a word on a transparent sheet and hold it up to the mirror. The mirror has not specifically chosen to reverse the letters—it has simply reversed the depth direction.
That is why a mirror is more mysterious than it first appears.
It doesn't reverse left and right.
It reverses front and back—and our brain interprets the result as left-right reversal.
No comments:
Post a Comment