In fact, light and other electromagnetic waves slow down when going through matter (unless it's opaque and they can't go at all).
In fact, light and other electromagnetic waves slow down when going through matter (unless it's opaque and they can't go at all).
实际上，光和其它电磁波在穿越物质时速度会减慢（除非是不透明物体，那就完全走不动了）。