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 m from a scree1l 4v 17 kh.xyefp7jbhn. Between the lamp and the screen is plrv3 734tweu8 nh2gnbj aced a converging lens of focal length 24 cm. The filament of the lamp can be imaged on the screen. As the lens po v3n2hwube 3j g8rtn47sition 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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