Physics, 02.03.2020 18:30, harlon852

A convex lens is held over a piece of paper outdoors on a sunny day. When the paper is held 26 cm below the lens, the sunlight is focused on the paper and the paper ignites. What is the focal length of the lens?

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A convex lens is held over a piece of paper outdoors on a sunny day. When the paper is held 26 cm be...