[单选题]
A student constructs1d0x1ybeh0g f pr 9m; lk7bjv4dpd) pu:l n2h.an astronomical telescope with a magnification of 10. If the telescope has a converging lens of focal l.hj)m dp:;9b2 l p4lvdu kr7pnength 50 cm, what is the focal length of the eyepiece?
A. $2.5 \; cm$
B. $5.0 \; cm$
C. $10 \; cm$
D. $25 \; cm$
Post time 2024-1-26 22:03:25