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Mystery #1Tier 2physics / light

Why can you see yourself in a mirror?

A mirror and a white wall are both solid surfaces bouncing light back at you. Yet the wall just looks pale and plain, while the mirror shows your whole face staring back. They both reflect light, so why does only one of them show a picture of you?

A mountain landscape mirrored perfectly in the still, smooth surface of a lake at golden light.
Photo: Johannes Plenio, Wikimedia Commons · CC0 · via Wikimedia Commons

Your guess

What's your hunch about what a mirror's surface does that a wall's surface doesn't?

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