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PREFACE

As I remarked in the preface to the previous edition of books 4-5, it is easy to be misled by Alhacen's analytic focus in those books into supposing that his primary aim in studying reflection was to explain how light interacts physically with reflecting surfaces. This supposition is not unreasonable in light of Alhacen's painstaking efforts in book 4 to validate the equal-angles law of reflection experimentally and in book 5 to determine with mathematical precision the point or points on various convex and concave mirrors from which a ray of light emanating from a given spot will reflect to a given center of sight. But these efforts were part of a more comprehensive program to put the ...

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