[单选题]
A student constructs an astr( jo3tsi ;qw5:a*ekena3 on 2mohhi qu(t+; 0o)hmp*ra2lz z,e nomical telescope with a magnification of 10. If the telescope has a converging lens of focal length uahz; +( zt)hl,irm * 2e0oqhp50 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