An optical experiment, by which a man and an angel demonstrate that the strength of a beam of light is not proportionate to the distance which it has travelled. Engraving by T. Galle, 1613, after P.P. Rubens.

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Optics - Experiments

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An optical experiment, by which a man and an angel demonstrate that the strength of a beam of light is not proportionate to the distance which it has travelled. Engraving by T. Galle, 1613, after P.P. Rubens.