[单选题]
A student constructs an ag65cb0h zq9u s/g0nygstronomical telescope with a magnification of 10. ,lfj8z4t h-v2z(h puh1eqd7d If the telescope has a converging lens of focal length 50 cm, what i71u 4h zz-djd8 le(v ,hhtf2qps the resulting length of the telescope?
A. $53 \; cm$
B. $55 \; cm$
C. $60 \; cm$
D. $75 \; cm$
