You combine two thin lenses by placing them in contact so
You combine two thin lenses by placing them in contact so that their axes coincide, forming what is called a compound lens. The focal lengths of the lenses are 25.3 cm and -55.5 cm, respectively. Find the focal length of this compound lens.
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you combine two thin lenses by placing them in contact so that their axes coincide forming what is called a compound
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