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Optics
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54. Long before either wave or particle, some (Pythagoras, Euclid, Hipparchus) thought that our eyes emitted some kind of substance that illuminated, or "felt," what we saw. (Aristotle pointed out that this hypothesis runs into trouble at night, as objects become invisible despite the eyes' purported power.) Others, like Epicurus, proposed the inverse--that objects themselves project a kind of ray that reaches out toward the eye, as if they were looking at us (and surely some of them are). Plato
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― Bluets
― Bluets
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It will reward enough for me if, by the publication of the present experiment, I have directed the attention of investigators to this subject, which still promises much for physical optics and appears to open a new field.
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