traditional household mirror usually has a reflective coating behind a layer of glass.
When you place your finger against the front surface, the glass creates a small physical distance between your fingertip and the reflective coating.
As a result, you may see a small gap between your fingertip and its reflected image.
However, the size of that gap depends on the construction of the mirror.
Different mirrors can have different glass thicknesses, reflective coatings, mounting methods, and optical properties.
Therefore, a visible gap does not prove that the mirror is
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