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]
A lamp is placed 1 mlpbr1,8 p4 niz4fbj.7uuzty v)-e+nl . c6ngoqk3-an from a screen. Between the lamp and the screen is placed a converging lens of focal length 24 cm. The filament of the lamp can be imaged on the scrgk n q3o6cn-a.een. As the lens position is varied with respect to the lamp,
A. no sharp image will be seen for any lens position.
B. a sharp image will be seen when the lens is halfway between the lamp and the screen.
C. a sharp image will be seen when the lens is 40 cm from the lamp.
D. a sharp image will be seen when the lens is 60 cm from the lamp.
E. a sharp image will be seen when the lens is either 40 cm from the lamp or 60 cm from the lamp, but not otherwise.
参考答案: E
本题详细解析:
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