利用拋物線的光學，來模擬手電筒的光線照射方式。可能可以依此發現，為何多數手電筒照射時，常常是一圈較亮，但中間偏暗。
宋政蒲
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- Target Group (Age)
- 3 – 19+
- Language
- Chinese Traditional / 繁體中文
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