The layer of the sun that radiates light is the photosphere.

Here's why:

* Photosphere: This is the visible surface of the sun. It's a layer of gas about 400 kilometers thick. The light we see from the sun originates from this layer.

* Other layers: The sun has several other layers, including the core, radiative zone, and convective zone, but these layers are internal and don't directly radiate light into space.

Let me know if you'd like to learn more about the sun's layers!