In an experiment for determination of the focal length of a thin convex lens, the distance of the object from the lens is 10±0.1cm and the distance of its real image from the lens is 10±0.2cm. The error in the determination of focal length of the lens is n %. The value of 10n is __

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In an experiment for determination of the focal length of a thin convex lens, the distance of the object from the lens is $10 \pm 0.1 c m$ and the distance of its real image from the lens is $10 \pm 0.2 c m$ . The error in the determination of focal length of the lens is n %. The value of 10n is __

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answer is 15.

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