Posted by Sandra on Sunday, July 19, 2009 at 3:15pm.
1/250=1/2,000,000 + 1/i agree
I like powers of ten
10^-2 / 2.5 = 10^-6 / 2 +1/i
(2/2.5)10-2 = 10^-6 + 2/i
(2/2.5) 10^4 = 1 + 2*10^6 / i
8*10^3 = 1 + 2*10^6/i
8000 i = i + 2*10^6
7999 i = 2*10^6
i = 2,000,000/7999
i = 250 mm
In other words the object is effectively at infinity and its image is effectively at the focal point.
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