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The Yerkes telescope in southern Wisconsin is the largest refracting telescope in the world. Its objective lens is 40 inches (slightly over a meter) in diameter. Its barrel length is 19.84 meters long. The barrel length of a refracting telescope also the sum of the focal lengths of its objective and the eyepiece lenses. The angular magnification to the telescope is 508. What are the focal lengths of the two lenses?

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