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]
The images formed by concaviv 4w/q ;.d5s+ux maol9ur6 lqe rpa y;uxkzq imi3 *p y*+8hme; v8.k1plenses
A. are always real.
B. are always virtual.
C. could be real or virtual; it depends on whether the object distance is smaller or greater than the focal length.
D. could be real or virtual, but always real when the object is placed at the focal point.
参考答案: B
本题详细解析:
暂无
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