SEARCHLIGHTS are now so common that it may be of interest to record that, as might have been expected, the beam shows the presence of polarisation, if it is viewed through a Nicol prism, the line of sight through the prism being perpendicular to the direction of the beam. On rotating the prism, the part of the beam viewed changes its intensity in such a way… (More)
DOI: 10.1038/098269b0


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