Small refracting spyglass telescope

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Reference no: EM13181636

A small refracting spyglass telescope has an objective lens with a diameter of 2 inches. The worlds largest refracting telescope at yerkes obseivrvatory has an objective lens with a diameter of 40 inches. Assuming that all light striking the objectives passes through them how much longer is tht lighht gathering power of yerkes than the spyglass?

Reference no: EM13181636

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