Light cannot travel through a material that has been made opaque.

Here's why:

* Opaque materials absorb or reflect all light that hits them, preventing it from passing through.

* Transparent materials allow light to pass through them almost completely, like glass.

* Translucent materials allow some light to pass through, but scatter it, making objects behind them appear blurry, like frosted glass.

Let me know if you'd like more details about any of these concepts!