http://www.digitalcamerapoint.com/lens-set/
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Lens Set
How would I find the focal length of a converging lens using a distant tree visible through a window?
I have to explain how I will estimate the length. What materials would I need in addition to the lens? How would I set up the equipment?
Thanks for your help. 
HyperPhysics.info is an awesome tool for physics projects. A quick search for "focal length" gives:
http://hyperphysics.info/?cx=partner-pub-6503468025187103%3Akxag2b-tx0r&cof=FORID%3A9&ie=ISO-8859-1&q=focal+length
Click the top link, that will give you the governing equations. Then click the second link and try out the built in calculator.
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