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An object is placed 230 cm to the left of a positive lens of focal length...

An object is placed 230 cm to the left of a positive lens of focal length 50.0 cm. A "mystery" lens is placed 140 cm to the left of original lens (so that it is located between the original lens and the object). The final image of this two-lens system appears inverted on a screen located 300.0 cm behind (to the right) of the original lens. Calculate the focal length of the "mystery" lens.

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