A convex lens is held over a piece of paper outdoors on
A convex lens is held over a piece of paper outdoors on asunny day. When the paper is held 26 {\rm cm} below the lens, the sunlight is focused on the paper and the paperignites. What is the focal length of the lens?
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a convex lens is held over a piece of paper outdoors on asunny day when the paper is held 26 rm cm below the lens the
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