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QUESTION
You focus sunlight on a piece of paper and find that the spot is 1 cm in diameter if the paper is placed 20 cm from the lens, and again if the paper...
You focus sunlight on a piece of paper and find that the spot is 1 cm in diameter if the paper is placed 20 cm from the lens, and again if the paper is placed 30 cm from the lens. What is the focal length of the lens in cm? The focal length of the lens is ____ cm.
