Geometrical Optics

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    By Dr. H. T. FIJNT has accomplished a task which leaves teachers of optics very much in his debt. He has produced an elementary treatise which begins at the very beginning of the subject, expounds a rule of signs lucidly and fully, and, after discussing in sufficient detail the topics associated with an intermediate course in optics, goes on to treat of thick lenses, combinations of lenses, aberrations of various kinds, apertures, photometry and optical instruments. Under the last heading are given brief but adequate discussions of the microscope and telescope, the eye and its defects, eyepieces, resolving powers, and various photographic objectives. Those of us who were trained in the optics of a generation ago will recognize the debt that the author owes (and acknowledges) to Drude, whose treatment of the one-to-one correspondence between points in the object- and the image-space is, in general, followed.

    Geometrical Optics

    By Dr. H. T. Flint. Pp. ix + 266. (London: Methuen and Co., Ltd., 1936.) 7s. 6d.

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