Abstract
AN interesting paper on this subject by R. Potter appeared in the year 18411. He “chiefly worked with an eye-lens, or else for micrometer measures with a compound microscope” and his conclusions (which are easily verified) are contained in the following passages: “The luminous ring is seen, and seen perfectly only, when the lens is so placed in its distance from the crystal, that what he [Lloyd] calls the two rays, are, in fact, the two virtual images of the luminous point on the first surface. The position of these virtual images within the crystal is found by the formulae of geometrical optics, their distance from the second surface, when the incidence is nearly perpendicular, being equal, thickness of the plate ”refractive index
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References
Potter, R., Phil. Mag., 18, 343 (1841).
Sorby, H. C., Min. Mag., 1, 193, Pl. vii, Fig. 10 (1877); ibid., 15, 189, Fig. 7 (1910).
Stokes, G. G., Rept. Brit. Assoc. for 1862, 253 (1863).
Clifford, W. K., Proc. Camb. Phil. Soc., 2, 157 (1876); reprinted in "Mathematical Papers", 21 (1882).
Raman, C. V., and Nedungadi, T. M. K., NATURE, 149, 553 (1942).
Graves, R. P., "Life of Sir William Rowan Hamilton", vol. 1, 630 (1882).
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MELMORE, S. CONICAL REFRACTION. Nature 150, 382–383 (1942). https://doi.org/10.1038/150382a0
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DOI: https://doi.org/10.1038/150382a0
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