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LORD BROUGHAM has recently been engaged in the investigation of a peculiar phenomenon which he calls the "diflection of light." The experiment itself consists in causing a ray of light to fall upon the sharp edge of a knife or on the point of a needle; the ray is thus "diflected" by the edge or point, and becomes prismatic.
Lord Brougham, in addition to other curious phenomena, has discovered that the ray, when once diflected, cannot be again diflected in the same direction, but may be diflected in an opposite direction.
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