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Galileo's Original Telescope

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See attached for exact description and figure.

The diagram above illustrates Galileo's original telescope. He used a convex objective lens with a focal length of 1.7m and a concave eyepiece as illustrated above. When this telescope is focused on an indefinitely distant object, its angular magnification is +3.

a. What is the focal length of the eyepiece?
b. What is the distance d between the two lenses?

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