Question: When an object is placed 60.0cm from a certain converging lens, it forms a real image. When the object is moved to 40.0cm from the

When an object is placed 60.0cm from a certain converging lens, it forms a real image. When the object is moved to 40.0cm from the lens, the image moves 10.0cm farther from the lens. Find the focal length of this lens.

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