* Reflection in a Plane Mirror: A plane mirror creates a virtual image that appears to be behind the mirror at the same distance as the object is in front of the mirror. The image is also laterally inverted (left and right are flipped).

* Equal Distances: The object and its image are always equidistant from the mirror.

* Direct Relationship: The image is formed by light rays reflecting off the mirror. Since the mirror reflects the light at the same angle it hits it, the image moves in direct correspondence to the object's movement.

* Result: If the object moves at a speed of 'v', the image appears to move at the same speed 'v' in the opposite direction.

In simpler terms: The image in a plane mirror is like a "shadow" that moves in sync with the object, but appears to be behind the mirror.