[填空题]
A microscope has a 12 fduy*ql2pjq*z1c 85v85 lzdi .0f3 b.4ni(wbo xbjz *d,t*gf3q$times$ eyepiece and a 59.0$times$ objective lens 20.0 $cm$ apart. Calculate
(a) the total magnification, $times$
(b) the focal length of each lens, $f_e$ = cm $f_o$ = cm
(c) where the object must be for a normal relaxed eye to see it in focus. $d_o$ = cm
