Credit: ©The Royal Society
    Image number: RS.15677

    Diagram on Alhazen's problem

    Date
    9 April 1672
    Creator
    Unknown, Artist
    Object type
    Archive reference number
    Manuscript page number
    p3a
    Material
    Dimensions
    height (page): 85mm
    width (page): 121mm
    Subject
    Physics
       > Optics
    Description
    A re-drawn figure from EL/H1/72/002, with the key 'Fig. 1', suggesting that this was used for printing in Philosophical Transactions of the Royal Society, vol. 8, no. 98 (where the same figure is labelled Fig. 1'). This pertains to Christian Huygens's solution to Alhazen's problem, conveyed to Henry Oldenburg in a letter dated 9 April 1672.

    The problem attributed to Alhazen (the Latinized name of Ibn al-Haytham (965-1045)) is to find a point of reflection on the surface of a spherical mirror in relation to two points, the eye and the visible object.
    Object history
    Printed as R. F. Slusius and C. Huygens, 'Continuation of the optical problem of Alhazen', Phil. Trans. vol. 8, no. 98 (November 1673), pp. 6140-46, fig. 1.
    Related fellows
    Christiaan Huygens (1629 - 2006, Dutch) , Natural philosopher
    Henry Oldenburg (1612 - 1677, German) , Scientific correspondent
    Associated place
    <The World>
       > Europe
          > Georgia
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