An object located in front of a flat mirror was moved 4 cm from it. How has the distance between the object and its image changed?

A flat mirror doubles the distance between an object and its reflection.
As far as the object is far from the mirror, so is the reflection far from it from its “mirror-like” side.
If the object begins to move toward the mirror, then its reflection will move to it from the “other” side exactly the same distance.
Therefore, the distance between them will be changed in double ratio.
Therefore, the distance between the object and its mirror image in the above example will decrease by 8 centimeters – 4 cm * 2 = 8 cm.

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