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An object 50 cm tall is placed on the principal axis of a concave lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens

Answer» An object 50 cm tall is placed on the principal axis of a concave lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens


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