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In modern life, we often use fitting rooms in hotels, shopping malls, or clothing stores. However, few people realize that behind what seems like an ordinary mirror could hide a threat to your privacy — a two-way mirror. So how can you recognize it and protect yourself?
1. The difference between a real mirror and a two-way mirror
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Real mirror: When you place your finger on the mirror, there will be a small gap between your fingertip and its reflection. This gap is caused by the protective glass layer.
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Two-way mirror: If your fingertip touches directly with the reflection (no gap), it may be a two-way mirror. This type has a special reflective coating that allows light to pass through from one side, meaning someone on the other side could see you without your knowledge.
2. Simple ways to test
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Finger test: Place your fingertip against the glass. If you see a gap, it’s safe. If there’s no gap, be cautious.
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Light test: Shine your phone flashlight closely at the mirror. If you notice light passing through or space behind it, it may be a two-way mirror.
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Knock test: Tap lightly on the mirror. If it sounds hollow or echoes, there might be empty space behind it.
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