A refracting telescope is used to view the moon diameter, Ask an Expert

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A refracting telescope is used to view the Moon (diameter 3480 km, distance from Earth 385,000 km). The focal lengths of the objective and eyepiece are +2.63 m and +18.9 cm, respectively.

(a) What should be the distance between the lenses?

(b) What is the diameter of the image produced by the objective?

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