📖 科普详解
📖 Science Details
主题引入
Introduction
窗户明明是一块硬邦邦的玻璃，我们却能透过它看见蓝天、树和路上的小汽车。小飞忍不住把脸贴在窗上：玻璃是不是偷偷开了一个看不见的大洞？
A window is a hard piece of glass, yet we see the blue sky, trees, and cars on the road through it. Xiao Fei could not help pressing his face to the window: did the glass secretly open an invisible big hole?
常见误解
Common Misconceptions
有人以为玻璃透明，是因为它“什么都没有”。其实玻璃里面当然有材料和原子，只是它们对大多数可见光很客气：不把光吃掉，也不把光到处乱赶。
Some think glass is transparent because it has nothing in it. Actually glass surely has material and atoms, but they are polite to most visible light: they do not eat the light or scatter it everywhere.
核心原理
Core Principle
我们能看见东西，是因为光带着颜色信息跑进眼睛。阳光或灯光照到物体后，部分光进入玻璃。普通透明玻璃会让大部分可见光穿过去，虽然光在进出玻璃时会稍微拐弯，这叫折射，但它仍能大致沿着原来的方向继续前进。
玻璃里的材料不会大量吸收可见光，也不会把光四面八方散开，所以眼睛能收到玻璃另一边传来的整齐画面。相反，木头会吸收和散射很多光，看起来不透明；磨砂玻璃里有粗糙表面或小结构，会把光打散，只能透亮却看不清。
We see things because light carries color information into the eyes. After sunlight or lamp light hits an object, part of the light enters the glass. Ordinary clear glass lets most visible light pass through; though the light bends a bit entering and leaving the glass, called refraction, it still roughly continues in its original direction. The material in glass does not strongly absorb visible light nor scatter it in all directions, so the eye receives a tidy picture from the other side. Wood, by contrast, absorbs and scatters much light and looks opaque; frosted glass has a rough surface or tiny structures that scatter light, so it lets light through but blurs the view.
生活应用
Real-World Application
窗户、眼镜镜片、鱼缸和玻璃杯都利用透明玻璃，让光通过，同时把空气、水或外面的东西隔开。戴眼镜时，镜片也会让光稍微折射，帮它更准确地落到眼睛里。
Windows, eyeglass lenses, fish tanks, and drinking glasses all use clear glass to let light through while separating air, water, or outside things. When wearing glasses, the lenses also refract light a bit to land it more accurately in the eye.
延伸知识
Extended Knowledge
透明不等于完全没有反射。站在窗边，特别是夜晚室内开灯时，你会看见玻璃上自己的影子，因为一部分光被玻璃表面反射了，另一部分才穿过去。绿色玻璃瓶有颜色，是因为它更容易吸收某些颜色的光，让剩下的绿色光通过或反射出来。
Transparent does not mean zero reflection. Standing by a window, especially at night with indoor lights on, you see your own reflection on the glass, because part of the light is reflected by the surface and only part passes through. A green glass bottle has color because it more easily absorbs some colors of light, letting the remaining green light pass or reflect.
一句话总结
One-Line Takeaway
玻璃能让大多数可见光整齐地穿过去，眼睛收到另一边的光，所以看起来透明。
Glass lets most visible light pass through in good order, the eye receives the light from the other side, so it looks transparent.