本题目来源于试卷: Physics Unit23: Light and Geometric Optics，类别为 通用国际物理
[单选题]
Two thin double-convex1nn-jmqj h10 l (pphz67:0j l(zznkx)ka4 m )mdg/ms j.convex-convex) lenses are placed in contact. If each has a focal length of 20 cm, how z(0 p jnz)ha:/kxs4 dg)l .kmmp6m7jzwould you expect the combination to function?
A. about like a single lens of focal length 20 cm
B. about like a single lens of focal length 40 cm
C. about like a single lens of focal length slightly greater than 20 cm
D. about like a single lens of focal length less than 20 cm
参考答案: D
本题详细解析:
暂无
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