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Updated: May 19, 2025
Causing the decomposed beam to pass through a second similar prism, but so placed that the colours are refracted back and reblended, the perfectly white luminous disk is restored. In this case, refraction and dispersion are simultaneously abolished. Are they always so? Can we have the one without the other? It was Newton's conclusion that we could not.
Yellow, blue, red, striped and parti-colored costumes, restless as the flotsam on a mill-race, swirled into patterns, and broke, and reblended. The long portico of Caesar's baths resounded to the hollow hum of voices. Streaming lines of slaves in the midst of the street were delayed by the crowd, and abused for obstructing it.
Altering in no particular the wedge-shaped vessel, but simply substituting for the water the transparent bisulphide of carbon, you notice how much higher the beam is thrown, and how much richer is the display of colour. It emerges decomposed at the other side. In that image the colours are reblended, and it is perfectly white.
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