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April 16, 2014

Homework Help: algebra

Posted by Sandra on Sunday, July 19, 2009 at 3:15pm.

Solve problem.
Telephoto lens. find
the image distance i for an object that is 2,000,000 mm from
a 250-mm telephoto lens.

tel formula is 1/f=1/o + 1/i

1/250=1/2,000,000 + 1/i
5i(1/250)=(1/2,000,000 + 1/i)5i
1/50i = 5i/400,000i + 5i/5i
1/10i = 5i/80,000i + 5i/5i

I=8,000
Is this right?

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