Posted by **help please** on Monday, March 2, 2009 at 6:49pm.

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 250-mm 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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