In the mentioned Activity, the approximate focal length of a convex lens is found by measuring the distance between the lens and the position of the image of the Sun. This distance provides an estimate of the focal length based on the convergence of parallel rays.
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In an activity involving a convex lens, you can find the focal length using the lens formula: 1/f = 1/u+ 1/v, where f is the focal length, u is the object distance (distance between the object and the lens), and v is the image distance (distance between the image and the lens). By measuring the object and image distances and plugging the values into the formula, you can solve for the focal length. The activity involves manipulating these distances to observe how they affect the formation and properties of the image formed by the convex lens.