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A Huygens ocular is constructed of 2 thin lenses of focal length 10 cm and 5 cm, respectively, separated by 7

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A Huygens ocular is constructed of 2 thin lenses of focal length 10 cm and 5 cm, respectively, separated by 7.5 cm. The ocular is used in an astronomical telescope whose objective is 30 cm to the left of the front lens of the ocular. What is the position of the exit pupil and what is the focal length of the ocular?