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 screensndd/ f(jiv7ol;hvh5y4wy wv9e1-4m 0c6 say. Between the lamp and thsrudv;;:b6 pa e screen is placed a converging lens of focal length 24 cm. The filament of the lamp ca;ud:bsr; pva6 n be imaged on the screen. 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:
暂无
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