[填空题]
The overall magnification of an , vg, ivkd/g2zh,izpy kk36p.astronomita/5 bd29d 4 hm(uoan;dchuz:blm;9 qcal telescope is desired to be 25$\times$. If an objective of 78$-cm$ focal length is used,
what must be the focal length of the eyepiece? $f_e$ = cm
What is the overall length of the telescope when adjusted for use by the relaxed eye? L = cm
