Scrolls World on Instagram: "Follow @scrollsworld for more 👇 The fingernail test is a common method used to determine if a mirror is a two-way glass by checking the distance between the finger and its reflection. To perform the test, you place your fingertip against the mirror surface and observe the point of contact. If there is a visible gap between your nail and the reflected image, it is typically a standard second-surface mirror where the reflective coating is behind a layer of glass. If t

Clip.Central Tv on Instagram: "Discover how to check if a mirror is disguised as a two-way glass with the simple fingertip test: Start by pressing your fingertip against the mirror’s surface. Observe the point where your nail meets its reflection. If there’s a gap between your nail and the reflection, you’re probably looking at an ordinary mirror with a reflective layer behind the glass. If your fingernail seems to touch its reflection directly, the mirror might be a first-surface mirror, often

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The most common way to identify a “two-way” mirror is the fingernail test, which relies on the physics of light reflection and the thickness of the glass. In a standard “second-surface” mirror, the reflective silvering is located behind a layer of glass; when you touch it, there will be a visible gap between your finger and its reflection because the light has to travel through the glass and back. If you touch a two-way mirror, there is typically no gap—your finger and the reflection will meet t