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Need help answering these questions 3. What is the focal length of a convex lens used as a magnifying glass, if the long is held

Need help answering these questions

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3. What is the focal length of a convex lens used as a magnifying glass, if the long is held 5 om from the object, and the image appear to be Som away? A conorve long used in the spectados of someone with short-sight has a focal length of Ban If an object is actually 10om away, how far will it appear to be from the lens

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