What is the compound focal length

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1. The focal length of a bi-convex thin lens is 10 cm. To a real image with magnification of -2, what is the object distance p? What is the image distance? Is it upright or inverted?

2. The focal length of a bi-convex lens is 10 cm. The focal length of a convex-concave thin lens is -20 cm. If placing them in parallel and in close contact, what is the compound focal length?

Reference no: EM13258466

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