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Reflections on a Gramophone Record
Published online by Cambridge University Press: 03 November 2016
Extract
When a point source of light is placed low over one side of a gramophone record and the eye is diametrically opposite it at about the same height, then the bright reflections on the record take the form of a rectangular cross, symmetrically placed. The direct image of the source is coincident with the centre of the record.
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- Copyright © Mathematical Association 1963
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