An object is placed in front of a convex lens. The image formed has a linear magnification of 2. The object is then moved towards the lens by 10 cm. Another image of the same linear magnification is formed. What is the focal length of the lens?
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$\begingroup$ Homework-like questions and check-my-work questions are considered off-topic. $\endgroup$– joseph hMar 19 at 5:06
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