Conversation

Here's a question for an RF expert...

Reflection of visible light can be diffuse or specular, depending on how smooth the surface is.

A mirror isn't perfectly smooth, but its irregularities are smooth enough that light mostly ignores them, and I assume that this has to do with the feature size of the irregularities versus the wavelength of light.

Drywall and concrete are diffuse in the visible spectrum, but are they diffuse between 2.5 and 5 GHz?