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Make sure you note left or right and which lens you are referring. An object is...

Make sure you note left or right and which lens you are referring. An object is placed in front of two thin lenses with focal lengths f1=-20 cm & f2=9.0 cm, with a lens separation of L=10.0 cm. The object is 9.0 cm from lens 1. Where is the image of the object? What is the magnification of the image? 12.

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