Figure 8: A water drop in air can focus light like a lens. As early as the 17th century the English scientist Stephen Gray used a water drop as a lens for a microscope he built. Photograph: Gadi Fishel.
Figure 8: A water drop in air can focus light like a lens. As early as the 17th century the English scientist Stephen Gray used a water drop as a lens for a microscope he built. Photograph: Gadi Fishel.
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