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A real inverted image I of an object O is formed by a certain lens. The object-image speration is d = 0.40m, measured along the central axis of the lens. The image is just half the size of the object. There is a figure to this problem and its an object O larger than image I. I is a smaller and inverted, the lens has to go in between the object and image.

They ask you what kind of lens must be used to produce this image? I know that it should be a converging lens.

Then they ask How far from the object must the lens be placed and what is the focal length of the lens.

I think that the intial step is to look at the lateral magnification which is 1/2 But from there I am stuck. In order to find part C I know it will be easy just the second part is giving me a hard time. Any help will be greatly appreciated.