What exactly normal radius in sculpt mode does?

Hi! Help me please to understand what exactly normal radius function in sculpt mode does?
If it possible show me some examples please. How exactley brush will influence to the mesh in 0,1 unit and in 2 unit? Am I right that normal radius woeks only with scrape brush? What the difference between normal radius and Radius of the brush?

Normal radius is how sensitive the brush tilts according to the mesh normals and brush radius is the size of the brush.

https://wiki.blender.org/wiki/Reference/Release_Notes/2.81/Sculpt

Tannk you, I read this, I try to understand how exactley does it work, maybe there is some example, wich demonstrate what exactley happens with mesh… I try to understand it by practice but can’t figure out. And the second question is this works only with scrape brush?