The trick lies in a phenomenon known as total internal reflection.

诀窍在于一种称为全内反射的现象。

The dots then re-emit the energy in longer wavelengths, which bounce along the window pane, rather than escaping – because of a physics thing called total internal reflection.

使辐射能在窗体内反射，而不泄漏出去因为有一种叫做「全内反射」的物理现象。