Hello everyone, I tried a problem on concave mirros and i have no idea why this is wrong. I was given enough info but still didn't like it. Here is the problem: Spherical mirrors. Object O stands on the central axis of a spherical mirror. The table gives object distance p, the type of mirror, and focal distance f. Find the image distance i and the lateral magnification m of the object, including signs. p (cm) = +25 Mirror = concave f (cm) = *17 Find i(cm) and m. Idon't know what the *17 means though! I just took it as a the foocal distance f = 17cm. http://suprfile.com/src/1/69173g/lastscan.jpg [Broken] Any idea where i f'ed it up? thanks!