First, you plot your u-v readings on a graph sheet as 1/u on the x-axis and 1/v on the y-axis. The y-intercept of the best-fit line gives you 1/f, so just take its reciprocal for the focal length. Honestly, I trust the graph method more than the calculation average because my laptop battery dies randomly, and I've lost calculated data before. The graph is safe on paper, like my sister's ration shop register—it doesn't crash.
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