Algebra  check to see if correct
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Telephoto lens. Use the formula from Exercise 67 to find the image distance i for an object that is 2,000,000 mm from a 250mm telephoto lens. (Section 6.7 (1/f = 1/0 +1/i)
1/i = 1/250  1/ (2*10^9)
i=25.
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