[填空题]
The eyepiece of a compoq88d(a 69z v;ed0trpx z1qfp w1 ka4b k3gp7-wehe5a p/9d0nm dmk*eaund microscope has a 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. $\times$
