Credit: ©The Royal Society
    Image number: RS.15911

    Diagram relating to Alhazen's problem

    Date
    22 November 1670
    Creator
    Unknown, Artist
    Object type
    Archive reference number
    Manuscript page number
    p2
    Material
    Dimensions
    height (page): 305mm
    width (page): 205mm
    Subject
    Physics
       > Optics
    Description
    Both Renatus Slusius and Christian Huygens were interested in the problem of finding a point of reflection on the surface of a spherical mirror in relation to two points, the eye and the visible object, attributed to Alhazen (the Latinised name of Ibn al-Haytham (965-1045)). The diagrams, relating to this problem, are from Slusius’s letter to Oldenburg dated 22 November 1670, in which he claimed that Huygens’s construction was the same as his. This letter was published by Oldenburg in Philosophical Transactions of the Royal Society, vol. 8, no. 97 (October 1673), pp. 6119-22, together with a letter from Huygens.

    There are copies of these diagrams at LBO/4/126 and LBC/4/173-74.
    Object history
    Printed as tab. 2, figs 2-4, in C. Huygens and R. F. Slusius, 'Some letters exchanged between Monsieur Slusius and Monsieur Hugenius, about a considerable optic problem (the point of reflection in a concave and convex mirror) of Alhazen', Phil. Trans. vol. 8, no. 97 (October 1673), pp. 6119-26 (pp. 6119-22).
    Related fellows
    Renatus Franciscus Slusius (1622 - 1685, Belgian) , Mathematician
    Henry Oldenburg (1612 - 1677, German) , Scientific correspondent
    Christiaan Huygens (1629 - 2006, Dutch) , Natural philosopher
    Associated place
    <The World>
       > Europe
          > Belgium
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