What did Light-Penetrating Magic Mirror look like?

Appears to be an ordinary bronze mirror with a smooth reflective face and raised decoration on the back. When the front reflects sunlight onto a wall, the wall displays the backside pattern.

How did Light-Penetrating Magic Mirror work?

During casting, the varying thickness of the backside decoration → differential cooling shrinkage → microscopic curvature differences form on the mirror face → polishing thins areas of greater curvature → scattered reflected light angles differ → the wall projection reveals the backside pattern.

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透光镜

Light-Penetrating Magic Mirror

A bronze mirror whose back bears cast decoration. When sunlight is reflected onto a wall, the backside pattern appears in the projection. Uses microscopic curvature differences on the mirror surface — a classic optical puzzle.

透光镜

Scientific Principle

Optics: microscopic curvature variations on the mirror surface cause different convergence/divergence of reflected light rays. Curved-mirror imaging principle.

透光镜

Light-Penetrating Magic Mirror

Scientific Principle

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