Question: A convex lens with 1 = 20.0 cm is mounted 40.0 cm to the left of a concave lens. When an object is placed 30.0

A convex lens with ƒ1 = 20.0 cm is mounted 40.0 cm to the left of a concave lens. When an object is placed 30.0 cm to the left of the convex lens, a real image is formed 60.0 cm to the right of the concave lens. What is the focal length ƒ2 of the concave lens?

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