Question: When an object is placed at the proper distance to the left of a converging lens, the image is focused on a screen 30.0cm to

When an object is placed at the proper distance to the left of a converging lens, the image is focused on a screen 30.0cm to the right of the lens. A diverging lens is now placed 15.0cm to the right of the converging lens, and it is found that the screen must be moved 19.2cm farther to the right to obtain a sharp image. What is the focal length of the diverging lens?

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