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Curious Carl and his lab partner were trying to answer the question: "What is white light?" To do this, Carl directed an intense beam of light through a glass _________ that had been placed on a piece of white paper. As the beam of light emerged from the opposite side, a rainbow of colors was produced on the white paper.

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KristennnBear
light through a glass prism. 
tramyaellison1

Carl directed a beam of light through a glass prism. The prism causes the white light to be refracted. Each wavelength bends at a different angle, so the visible spectrum is seen on the opposite side, emerging from the prism.