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You are given two identical plano-convex...

You are given two identical plano-convex lenses. When you palce an object 20cm to the left of a single plano-convex lens, the image appears 40cm to the right of the lens. You then arrange the two plano-convex lenses back to back to form a double convex lens. If the object is 20cm to th eleft of this new lens, what is the approximate location of the image?

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