SURFACE TENSION

By Richard Germain

A safety pin was gently dropped on water. The surface tension caused by the intermolecular forces of the water keeps the pin from sinking but the surface is bent by the weight of the pin. At the same time, a light table with an array of small black squares painted on its surface was used to illuminate the pin and the water. The deformed surface acts as a convex mirror around the pin and creates a reduced size virtual image of the light table grid.

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