Foucault invented in 1857 the polarizer which bears his name, and in the succeeding year devised a method of giving to the speculum of reflecting telescopes the form of a spheroid or a paraboloid of revolution. [Please select]
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Introducing a plate of quartz between the polarizer and the spar, the two images glow with complementary colours. [Please select]
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43, where N is the end of the polarizer, Q the quartz plate, L a lens, and B the bi-refracting spar. [Please select]
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Through this glass the beam from the polarizer now passes, being intercepted by the Nicol in front. [Please select]
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The experiment may be varied in this way: Placing in front of the polarizer a plate of unannealed glass, you have a series of beautifully coloured rings, intersected by a black cross. [Please select]
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