The image obtained with a convex lens is erect and its length is 4 times the length of the object. If the focal length of lens is 20 cm, calculate

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The image obtained with a convex lens is erect and its length is 4 times the length of the object. If the focal length of lens is 20 cm, calculate the object and image distances.

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Correct Answer - 15 cm, - 60 cm