Name: 凸透鏡 - 放大鏡能燒紙嗎？| 凸透鏡 - 凸透鏡能燒紙嗎？ (Convex Lens - Can a magnifying glass burn paper? | #aumsum)
Uploaded: 2021-01-14T08:10:52.000Z
Duration: 51 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

It is because a magnifying glass is actually a convex lens.

A convex lens is thicker in the middle and thinner at the edges.

This shape of the convex lens makes the parallel rays of sunlight to refract.

Such that they converge or come together at a point.

So, when they come together, do they have a party?

As the rays converge, the concentration of sunlight at that point increases, thus producing heat.

This heat starts a fire which eventually causes the paper to burn.

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凸透鏡 - 放大鏡能燒紙嗎？| 凸透鏡 - 凸透鏡能燒紙嗎？ (Convex Lens - Can a magnifying glass burn paper? | #aumsum)

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