[填空题]
Sherlock Holmes is us +1x pkzapblsn;0hr:1ing qlu6lej)cn :jq z6nk3 11td4aa 9.00-$cm$-focal-length lens as his magnifying glass. To obtain maximum magnification, where must the object be placed (assume a normal eye), and what will be the magnification?
$d_o$ = cm from the lens
M = $\times$
