I was answering you but i forgot sry for dat
The student that measured the mass to be 16110g got closest to the known result. She is off by 10 g.
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Answer: The nearest position of an object from a normal human eye so that its image is formed on retina is 25 CM. If the object is placed at a distance less than 25 CM, then the blurred image of the object is formed on retina as the focal length of a lens cannot be decreased below a certain limit. Hence we cannot see it clearly.
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