Question: By placing an object 40 cm from a converging lens, a real image is obtained 7.5 cm high and placing the same object at a

By placing an object 40 cm from a converging lens, a real image is obtained 7.5 cm high and placing the same object at a distance of 25 cm, the real image obtained is 15 cm high. Determine the focal length of the lens and the size of the object.

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