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Q. A farsighted person has a nearpoint of 100 cm from her eyes. What power and type of lens will correct this condition and allow the person to read a book at 25 cm?

Q. Two water reservoirs are open to the atmosphere. The manometer contains mercury with a density of 13,600 kg/m cubed. What is the difference in elevation if the manometer reading is 25.0 cm?

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