[填空题]
The eyepiece of a compound micv l30jnm ;p s )mn70jtxb3kq1ln0. dooroscope has ao6 pk+629kb,8xfqa ubyxjaws.2td6f1 ;y tdm focal length of 2.70 $cm$, and the objective lens has $f=0.740\mathrm{~cm}$. If an object is placed 0.790 $cm$ from the objective lens, calculate
(a) the distance between the lenses when the microscope is adjusted for a relaxed eye, $l$ = cm
(b) the total magnification. $\times$
