问题
选择题
小明同学在课外用易拉罐对着点燃的蜡烛做小孔成像实验。如果易拉罐底部有一个很小的三角形小孔，则他在半透明纸上看到的像是[ ]
A、蜡烛的正立像
B、蜡烛的倒立像
C、三角形光斑
D、圆形光斑。
答案
答案：B
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小明同学在课外用易拉罐对着点燃的蜡烛做小孔成像实验。如果易拉罐底部有一个很小的三角形小孔，则他在半透明纸上看到的像是[ ]
A、蜡烛的正立像
B、蜡烛的倒立像
C、三角形光斑
D、圆形光斑。
答案：B
| 单句改错。 | |
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