[单选题]
A student constructs an astronomical telescope winx 6vkf46z;t cth a magni7uaikf91r llk1(u ws* fication of 10. If the telescope has a converging lenuf1ia1l sl kuk 7(w*r9s of focal length 50 cm, what is the resulting length of the telescope?
A. $53 \; cm$
B. $55 \; cm$
C. $60 \; cm$
D. $75 \; cm$
Post time 2024-1-26 22:03:25