[单选题]
A student constructs an astronomicm;b r+ i;n bbznp wy)fp68t4x:al telescog( gh5agv ugtn:h9:q 8pe with a magnification of 10. If the telescope has a converging lens of focal length 50 cm, what is the fo5 gu aqhgn9::hg8 tv(gcal 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