Posted by help please on Sunday, March 1, 2009 at 6:57pm.
250 mm is the focal length, f.
2*10^6 mm (2km) is the object distance, which you call "o". (It is usually written Do.)
Solve the equation provided to compute the image distance "i".
1/i = 1/250 - 1/(2*10^9)
"i" will be only slightly larger than 250 mm
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