1. The problem statement, all variables and given/known data Rearrange the lens equation to make 1/v the subject of the equation and then write it as a linear equation. This will lead you to a possible graph for data of object distances and image distances from which you will be able to evaluate the focal length f of the convex lenses. 2. Relevant equations *lens equation: 1/f=1/u+1/v 3. The attempt at a solution I don't really understand what I'm supposed to do. I mean, usually we have equations like y=kx and all we do is to find the slope k. But for the equation 1/v=1/f-1/u ? I really don't get this. Should I make it into v=uf/(u-f)? I think that's the right way but I dont know if i can get f using that equation. Please HELP!