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A small telescope has an objective lens ...

A small telescope has an objective lens of focal length 140 cm and an eyepiece of focal length 5.0 cm. (A) If this telescope is used to view a 100 m tall tower 3 km away, what is the height of the image of the tower formed by the objective lens? (B) What is the height of the final image of the tower if it is formed at 25 cm?

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