Question: Problem 5. An object to the left a lens produces an image on a screen 30cm to the right of the lens. When the lens

Problem 5. An object to the left a lens produces an

Problem 5. An object to the left a lens produces an image on a screen 30cm to the right of the lens. When the lens is moved 4cm to the right, the screen must be moved 4cm to the left to refocus the image. What is the focal length of the lens

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