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Consider an object, an image and a lens. Think about how to place the object, image...

Consider an object, an image and a lens. Think about how to place the object, image and lens such that the magnification is M = +1.5 and that the image is located 30 cm from the lens. What is the focal length of the lens that you must use? (Hint: First draw out possible scenarios before to decide on the best relative placements before attempting to find f.)

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