This is the link for this lab: https://www.compadre.org/Physlets/optics/prob33_7.cfmAnswer all with bold and underline

Please answer all 's. Summary of symbols, and meanings for + and - signs. r is used to get f, for concave f is + and to the left, and for convex fis - and to the right. do is always + to the left. di is + to the left for concave with do > f, and di is - to the right for concave with do