Credit: ©The Royal Society
    Image number: RS.14980

    Diagram relating to Alhazen's problem

    Date
    22 November 1670
    Creator
    Unknown, Artist
    Object type
    Archive reference number
    LBC
    Manuscript page number
    vol4 p177
    Material
    Dimensions
    height (page): 301mm
    width (page): 178mm
    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 diagram, relating to this problem, is from Slusius’s letter to Oldenburg, 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.

    This is copied from LBO/4/128. The diagram in the original letter is at EL/S1/66/004.
    Object history
    Printed 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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