第5课

第二单元

Unit 2

我们怎么看到物体

How do we see objects

第五课

Lesson Five

凸透镜

Convex lens

1.凸透镜有什么秘密 ？我们准备一下材料来研究 。

What's the secret of convex lens? Let's prepare some materials to study.

l 放大镜，蜡烛，火柴，纸屏，支架，透明的玻璃瓶或塑料瓶，激光灯 。

Magnifying glass, candle, match, paper screen, bracket, transparent glass or plastic bottle, laser light.

2.我们观察放大镜 。

We look at the magnifying glass.

镜片，镜柄，镜框

Lens, handle, frame

像放大镜这样的边缘薄、中间厚的透明镜片 ，称为“凸透镜 ”

Transparent lenses with thin edges and thick middle, such as magnifiers, are called convex lenses

3.凸透镜有什么作用 ？

What is the function of convex lens?

（1）光斑落在哪里 ？

Where is the spot?

不要用激光灯照射眼睛 ！

Don't shine laser light on your eyes!

（2）我发现 ……

I found that

不要用凸透镜看太阳 ，否则会灼伤眼睛 ！

Don't look at the sun with a convex lens, or you will burn your eyes!

想办法让蜡烛火焰的像呈现在纸屏上。

Try to make the image of candle flame appear on the paper screen.

蜡烛，纸屏，凸透镜

Candles, paper screens, convex lenses

实验记录

Experimental record

我的做法 ：

My approach:

我的发现 ：

My findings:

凸透镜有放大，聚光，成像的作用 。

Convex lens has the function of magnifying, concentrating and imaging.

4.这个凸透镜 。

This convex lens.

在瓶内加入水试试 。

Try adding water to the bottle.

我用水滴做一个。

I make one out of water drops.

5.生活中哪些地方用到了凸透镜 ？他们给人们带来了哪些便利 ？

Where are convex lenses used in life? What conveniences do they bring to people?