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Updated: May 2, 2025
Lenses were exhibited to the Royal Society, London, varying from to -6 DCy, and from to +6 DCy. By H. BECQUEREL. The absorption spectrum observed through a crystal varies with the direction of the rectilinear luminous vibration which propagates itself in this crystal. 2. The bands or rays observed through the same crystal have, in the spectrum, fixed positions, their intensity alone varying. 3.
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