The sisters were identical twins who often confused people with their mirror image.
exact copy
Frequency:
70
%
The painting was an exact copy of the original.
perfect reflection
Frequency:
60
%
The lake provided a perfect reflection of the mountains.
Idiomatic Expressions for mirror image
Phrase: be the mirror image of
Meaning: to closely resemble or be very similar to someone or something
Usage: The two sisters are the mirror image of each other, both in looks and personality.