評論
打印
Prisms
棱鏡
Why can we see rainbows after rain?
我們雨后為什么能看到彩虹？
We can see rainbows after rain because droplets of moisture in the air work like a big prism.
這是因為空氣中的水滴就像一個大棱鏡。
So what is a prism?
那么什么是棱鏡呢？
It is a piece of glass. It usually has a triangular shape.
它是一塊玻璃，通常有三角。
What does the prism do?
棱鏡的作用是什么？
It reflects and separates light.
它能反射和分散光線。
When we look at sunlight, it seems white.
我們看陽光時，它似乎是白色的。
However, if you see sunlight through a prism,
但如果你透過棱鏡看到陽光的話，
you'll know that there are different colours from red to violet in the white light, just like a rainbow.
你就會知道，白光中有不同的顏色，從紅到紫，就像彩虹一樣。
Because of prisms, we know that sunlight is a mixture of different colours.
因為棱鏡，我們知道太陽光是不同顏色的混合物。
