Science Buddies: "Ask an Expert"

Hi,
I am having difficulty with this project to get my lamp to project the gridlines from the tennis racket onto a hand and get the size to match the graph paper so that my subjects can record the contact spot accurately. Any ideas? Please.

I am having trouble understanding the part about "getting the size to match the graph paper?" What are you trying to do? Can you please explain what you plan to do in a bit more detail so I can help you?

Shijun