This is the 6663rd most frequent Russian word.
mirror
A reflective surface, typically made of glass coated with a metal amalgam, that reflects a clear image.
Here, the word 'зеркало' refers to a physical mirror that reflects an image.
Я посмотрел в зеркало, чтобы поправить волосы.
I looked in the mirror to fix my hair.
Here, 'зеркального отражения' refers to the mirrored reflection created by the camera effect.
Фильтр камеры создал эффект зеркального отражения.
The camera filter created a mirror reflection effect.
In this sentence, 'зеркала' metaphorically describes eyes as reflective surfaces revealing inner emotions.