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Foucault
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noun
French physicist who determined the speed of light and showed that it travels slower in water than in air; invented the Foucault pendulum and the gyroscope (1819-1868)
prism
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noun
a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms
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noun
optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image