Abstract
IT is a matter of general knowledge that a very thin plate of a transparent substance exhibits colours, the tints of which depend upon the angle of incidence of the light by which it is viewed, and also upon its thickness and refractive index, and that these “colours of thin plates” were classified by Newton and divided by him into orders. If, however, such a plate is of less than a certain thickness, it appears black whatever the angle of incidence of the light may be, and its colour, therefore, gives us no indication of its thickness, except that it must be less than a particular value.
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RÜCKER, A. On Black Soap Films . Nature 16, 331–333 (1877). https://doi.org/10.1038/016331a0
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DOI: https://doi.org/10.1038/016331a0