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
                            
                        
                            
                            
                            width (page): 121mm
                                Subject
                            
                            
                            
                        
                            
                            
                            
                                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.
                            
                            
                        
                            
                            
                            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
                            
                        
                            
                            
                            Henry Oldenburg (1612 - 1677, German) , Scientific correspondent
                                Associated place